Aulus Gellius, Noctes Atticae, bk. 12, ch. 2, sect. 13; translation from Riad Aziz Kassis The Book of Proverbs and Arabic Proverbial Works (Leiden: Brill, 1999) p. 159.
Misattributed
Quid enim refert, quantum habeas? multo illud plus est, quod non habes.
Source: The Warrior Within : The Philosophies of Bruce Lee (1996), p. 117
The Power of Now (1997)
“What you do makes a difference, and you have to decide what kind of difference you want to make.”
"Say It Again" from N.B. and Pocketful of Sunshine (2007)
The first two sentences of this statement first appear as attributed to France in the 1990s, but the full statement is earlier attributed to William Feather, as quoted in Telephony, Vol. 150 (1956), p. 23 http://books.google.com/books?id=Wm0jAQAAMAAJ&q=%22being+able+to+differentiate+between+what+you+do+know%22&dq=%22being+able+to+differentiate+between+what+you+do+know%22&hl=en&sa=X&ei=qYJOU9dAzoXRAYumgcAP&ved=0CMsCEOgBMDQ
Misattributed
As quoted in Telephony, Vol. 150 (1956), p. 23 http://books.google.com/books?id=Wm0jAQAAMAAJ&q=%22being+able+to+differentiate+between+what+you+do+know%22&dq=%22being+able+to+differentiate+between+what+you+do+know%22&hl=en&sa=X&ei=qYJOU9dAzoXRAYumgcAP&ved=0CMsCEOgBMDQ; the first two sentences of this statement began to be attributed to Anatole France in the 1990s, but without any citations of sources.
“Act as if what you do makes a difference. It does.”
Reverence for Life (1969)
Context: I do not want to frighten you by telling you about the temptations life will bring. Anyone who is healthy in spirit will overcome them. But there is something I want you to realize. It does not matter so much what you do. What matters is whether your soul is harmed by what you do. If your soul is harmed, something irreparable happens, the extent of which you won't realize until it will be too late.
