Iron sharpens iron.
How do you know what is good company and bad company?
We must surround ourselves with people who lift us up rather than bring us down. Seek out friends who are willing to tell you the truth and be honest with you even when you don’t want to hear it. If you already have people like this in your life that refine you - seek to help others.
"Associate with men of good quality if you esteem your own reputation; for it is better to be alone than in bad company." - George Washington