It's a disgrace in this life when the soul surrenders first while the body refuses to.
— Marcus Aurelius, Meditations, 6.29 —
From good people you'll make learn good, but if you you mingle with the bad you'll destroy such soul as you had.
—Masonius Rufus, Quoting Theognis of Megara, Lectures, 11.53.21-22 (resource) The Daily Stoic: 366 Meditations on Wisdom
The soul is like a bowl of water, and our impressions are like the ray of light falling upon the water. When the water is troubled, it appears that the light itself is moved too, but it isn't. So, when a person loses their composure it isn't their skills and virtues that are troubled, but the spirit in which they exist, and when that spirit in which they exist, and when that spirit calms down so do those things.
—Epictetus, Discourses, 3.3.20-22
3 in whom are hidden all the treasures of wisdom and knowledge. 4 I tell you this so that no one may deceive you by fine-sounding arguments.5 For though I am absent from you in body, I am present with you in spirit and delight to see how disciplined you are and how firm your faith in Christ is.[Colossians 2:3-8]