
“I'm suspicious of people who don't like dogs, but I trust a dog when it doesn't like a person.”
Written in a letter to Francois Lafargue in Bordeaux, 12 November 1866 as published in MECW Volume 42, p. 334. as "That a man who does not love wine will never be good for anything," which was a restating of the phrase wine, women and song that was attributed to Martin Luther at that time.
Source: https://www.marxists.org/archive/marx/works/1866/letters/66_11_12.htm
“I'm suspicious of people who don't like dogs, but I trust a dog when it doesn't like a person.”
“Now drown care in wine.”
Nunc vino pellite curas.
Book I, ode vii, line 32
Odes (c. 23 BC and 13 BC)
“We are afraid to care too much, for fear that the other person does not care at all.”
“After all, damn it, what does being in love mean if you can't trust a person.”
Source: Vile Bodies
Chap. 11, "The Fat Man"
Dialogue between the characters Kasper Gutman (the "fat man") and Sam Spade.
Source: The Maltese Falcon (1930)
Context: "We begin well, sir," the fat man purred … "I distrust a man that says when. If he's got to be careful not to drink too much it's because he's not to be trusted when he does. … Well, sir, here's to plain speaking and clear understanding. … You're a close-mouthed man?"
Spade shook his head. "I like to talk."
"Better and better!" the fat man exclaimed. "I distrust a close-mouthed man. He generally picks the wrong time to talk and says the wrong things. Talking's something you can't do judiciously unless you keep in practice."
“Don't trust the person who has broken faith once.”