Moreover, the precepts of wisdom should be definite and certain: when things cannot be defined, they are outside the sphere of wisdom; for wisdom knows the proper limits of things. “We should therefore do away with this department of precepts, because it cannot afford to all what it promises only to a few; wisdom, however, embraces all.
Book: Moral Letters Vol III
Subtitle: Seneca's timeless letters of advice and wisdom.
Author: Seneca
Chapter: On the value of advice
Location: Chapter 94, Section 16
Content:
16.
Moreover, the precepts of wisdom should be definite and certain: when things cannot be defined, they are outside the sphere of wisdom; for wisdom knows the proper limits of things. “We should therefore do away with this department of precepts, because it cannot afford to all what it promises only to a few; wisdom, however, embraces all.