That which leads to a general agreement, and likewise to a perfect one, is an assured belief in certain facts; but if, lacking this assurance, all things are adrift in our minds, then doctrines are indispensable; for they give to our minds the means of unswerving decision.
Book: Moral Letters Vol III
Subtitle: Seneca's timeless letters of advice and wisdom.
Author: Seneca
Chapter: On the usefulness of basic principles
Location: Chapter 95, Section 61
Content:
62.
That which leads to a general agreement, and likewise to a perfect one, is an assured belief in certain facts; but if, lacking this assurance, all things are adrift in our minds, then doctrines are indispensable; for they give to our minds the means of unswerving decision.