Intellectual over-indulgence is the most gratuitous and disgraceful form which excess can take, nor is there any the consequences of which are more disastrous.
 Samuel Butler, The Note-Books of Samuel Butler (1912). copy citation

Context

“With regard to the body politic as a whole, it is, no doubt, well that there should be some men and women so built that they cannot be stopped from working themselves to death, just as it is unquestionably well that there should be some who cannot be stopped from drinking themselves to death, if only that they may keep the horror of the habit well in evidence. Intellectual Self-Indulgence Intellectual over-indulgence is the most gratuitous and disgraceful form which excess can take, nor is there any the consequences of which are more disastrous. Dodging Fatigue When fatigued, I find it rests me to write very slowly with attention to the formation of each letter. I am often thus able to go on when I could not otherwise do so. Vice and Virtue i” source