A quote
I could not easily tell you how it helps us, though I am certain of the fact that I have received help in that way. Phaedo says: “Certain tiny animals do not leave any pain when they sting us; so subtle is their power, so deceptive for purposes of harm. The bite is disclosed by a swelling, and even in the swelling there is no visible wound.” That will also be your experience when dealing with wise men, you will not discover how or when the benefit comes to you, but you will discover that you have received it.
Seneca·Letter 94 (§41)·trans. Gummere