“There is no end to our researches; our end is in the other world. It is a sign of contraction of the mind when it is content, or of weariness. A spirited mind never stops within itself; it is always aspiring and going beyond its strength; it has impulses beyond its powers of achievement. If it does not advance and press forward and stand at bay and clash, it is only half alive.”

III.13 “Of experience” (p. 996)