“I know what we do is right but right doesn't always mean easy.”

Source: The Last Song

Source: Clockwork Prince

Source: Dash & Lily's Book of Dares

Source: Never Again: Securing America and Restoring Justice (2006), p. 229

"De Litteris Colendis", in Jean-Barthélemy Hauréau De la philosophie scolastique (1850) p. 10; translation from T. H. Huxley Science and Education ([1893] 2007) p. 132; in Latin, Quamvis enim melius sit benefacere quam nosse, prius tamen est nosse quam facere.

1990s, Interview outside courthouse (1994)

lecture I: "The Uncertainty of Science"
The Meaning of It All (1999)

Athyra (1993)
Context: 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.

Speech delivered in Finney Chapel at Oberlin College (22 October 1964), as reported in "When MLK came to Oberlin" by Cindy Leise, The Chronicle-Telegram (21 January 2008) http://chronicle.northcoastnow.com/2008/01/21/when-mlk-came-to-oberlin/
1960s
Variant: The time is always right to do what’s right.