„Act in such a way that your heart may be free from hatred.“

„The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.“

—  Albert Camus French author and journalist 1913 - 1960

To be found on quotes sites, but always without citation.
Disputed

„Along the road your steps may stumble
Your thoughts may start to stray
But through it all a heart held humble
Levels and lights your way.“

—  Dan Fogelberg singer-songwriter, musician 1951 - 2007

Along the Road.
Song lyrics, Phoenix (1979)

„Perhaps some arm, more lucky than the rest,
May reach his heart, and free the world from bondage.“

—  Joseph Addison, libro Cato

Act II, scene i.
Cato, A Tragedy (1713)
Contexto: My voice is still for war.
Gods! Can a Roman senate long debate
Which of the two to choose, slavery or death?
No, let us rise at once,
Gird on our swords, and,
At the head of our remaining troops, attack the foe,
Break through the thick array of his throng'd legions,
And charge home upon him.
Perhaps some arm, more lucky than the rest,
May reach his heart, and free the world from bondage.

„Do not act meanly, do not be unkind, because the time for setting things right may pass before your heart changes course.
Isabel Dalhousie“

—  Alexander McCall Smith, libro The Careful Use of Compliments

Fuente: The Careful Use of Compliments

„Hatred comes from the heart; contempt from the head; and neither feeling is quite within our control.“

—  Arthur Schopenhauer, libro Parerga y paralipómena

"Psychological Observations"
Parerga and Paralipomena (1851), Studies in Pessimism

„I may seem proud; I may act gay,
It's just a pose; I'm not that way,
.'Cause deep down in my heart I say,
I surrender, dear.“

—  Gus Arnheim American musician 1897 - 1955

Song I Surrender, Dear

„May your heart always be joyful. May your song always be sung.“

—  Bob Dylan American singer-songwriter, musician, author, and artist 1941

Song lyrics, Planet Waves (1974), Forever Young
Contexto: May your hands always be busy. May your feet always be swift. May you have a strong foundation when the winds of changes shift. May your heart always be joyful. May your song always be sung. May you stay forever young.

„If you want the world to know
We won't let hatred grow
Put a little love in your heart.“

—  Jackie DeShannon American singer-songwriter 1941

"Put A Little Love In Your Heart" (1968); written with Jimmy Holiday and Randy Myers

„Always act in such a way as to secure the love of your neighbour.“

—  Pliny the Elder, libro Naturalis historia

Book XVIII, sec. 44.
Naturalis Historia

„Still, a prince should make himself feared in such a way that if he does not gain love, he at any rate avoids hatred; for fear and the absence of hatred may well go together, and will be always attained by one who abstains from interfering with the property of his citizens and subjects or with their women.“

—  Niccolo Machiavelli, libro El Príncipe

Fuente: The Prince (1513), Ch. 17
Contexto: Still, a prince should make himself feared in such a way that if he does not gain love, he at any rate avoids hatred; for fear and the absence of hatred may well go together, and will be always attained by one who abstains from interfering with the property of his citizens and subjects or with their women. And when he is obliged to take the life of any one, to do so when there is a proper justification and manifest reason for it; but above all he must abstain from taking the property of others, for men forget more easily the death of their father than the loss of their patrimony. Then also pretexts for seizing property are never wanting, and one who begins to live by rapine will always find some reason for taking the goods of others, whereas causes for taking life are rarer and more quickly destroyed.

„Hatred is a thing of the heart, contempt a thing of the head.“

—  Arthur Schopenhauer, libro Parerga y paralipómena

Vol. 2, Ch. 24, § 324
Variant translation: Hatred is an affair of the heart; contempt that of the head.
As translated by Eric F. J. Payne
Parerga and Paralipomena (1851), Counsels and Maxims
Contexto: Hatred is a thing of the heart, contempt a thing of the head. Hatred and contempt are decidedly antagonistic towards one another and mutually exclusive. A great deal of hatred, indeed, has no other source than a compelled respect for the superior qualities of some other person; conversely, if you were to consider hating every miserable wretch you met you would have your work cut out: it is much easier to despise them one and all. True, genuine contempt, which is the obverse of true, genuine pride, stays hidden away in secret and lets no one suspect its existence: for if you let a person you despise notice the fact, you thereby reveal a certain respect for him, inasmuch as you want him to know how low you rate him — which betrays not contempt but hatred, which excludes contempt and only affects it. Genuine contempt, on the other hand, is the unsullied conviction of the worthlessness of another.

„If you really feel hatred for someone, and kind of send it their way, then it’s out of your system and in their hands. I always think it’s therapeutic.“

—  Marilyn Manson American rock musician and actor 1969

„It was obvious that bigotry was never a one-way operation, that hatred bred hatred!“

—  Isaac Asimov, libro Pebble in the Sky

Fuente: Pebble in the Sky

„I may be soft in your palm,
But I'll soon grow hungry for a fight, and I will not let you win.
My pretty mouth will frame the phrases that will disprove your faith in man.
So if you catch me trying to find my way into your heart from under your skin,Fast as you can, baby
Scratch me out, free yourself.“

—  Fiona Apple singer-songwriter, musician 1977

Fast as You Can
Song lyrics, When the Pawn… (1999)

„May my heart be your shelter, and my arms be your home.“

—  Marianne Williamson American writer 1952

Fuente: A Return to Love: Reflections on the Principles of "A Course in Miracles"

„Remember that yours is not the only heart that may be wishing for love.“

—  Cameron Dokey American writer 1956

Fuente: Before Midnight: A Retelling of Cinderella

„It isn't always easy to act on what's in your head instead of what's in your heart. And it isn't always right to.“

—  Steven Brust, libro Athyra

Athyra (1993)
Contexto: It isn't always easy to act on what's in your head instead of what's in your heart. And it isn't always right to. The whole trick to knowing what to do is deciding when to make yourself listen to your head, and when it's okay to just follow your feelings.

„To act nobly, a noble heart is not enough. It needs help from a sharp mind.“

—  Leon R. Kass American academic 1939

Looking for an Honest Man (2009)
Contexto: To act nobly, a noble heart is not enough. It needs help from a sharp mind. Though the beginnings of ethical virtue lie in habituation, starting in our youth, and though the core of moral virtue is the right-shaping of our loves and hates, by means of praise and blame, reward and punishment, the perfection of character finally requires a certain perfection of the mind.

„It may be an infinitely less evil to murder a man than to refuse to forgive him. The former may be the act of a moment of passion: the latter is the heart’s choice.“

—  George MacDonald Scottish journalist, novelist 1824 - 1905

‘’It Shall Not Be Forgiven’’
Unspoken Sermons, First Series (1867)
Fuente: Unspoken Sermons: Series I, II, III