Facts are like cows. If you look them in the face long enough, they generally run away.

The great advantage about telling the truth is that nobody ever believes it.

If it ever occurs to people to value the honour of the mind equally with the honour of the body, we shall get a social revolution of a quite unparalleled sort.

The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.

See that the mind is honest, first; the rest may follow or not as God wills. [That] the fundamental treason to the mind ... is the one fundamental treason which the scholar's mind must not allow is the bond uniting all the Oxford people in the last resort.

To make a deliberate falsification for personal gain is the last, worst depth to which either scholar or artist can descend in work or life.

(Letter to Muriel St. Clare Byrne, 8 September 1935)