Above all, keep a close watch on this- that you are never so tied to your former acquaintances and friends that you are pulled down to their level. If you don't, you'll be ruined... You must choose whether to be loved by these friends and remain the same person, or to become a better person at the cost of those friends... if you try to have it both ways you will neither make progress nor keep what you once had.

— Epictetus, Discourses, 4.2.1; 4.5, (resource) The Daily Stoic: 366 Meditations on Wisdom