Associate yourself with people of good quality, for it is better to be alone than in bad company.
Over the past decade I have learned this firsthand.
I had a business partner who was at his core a very bad person. Like a lot of nefarious people, it wasn’t apparent to me until far too late in the relationship that his character was evil and that associating with him would destroy a large portion of my life.
Now older and wiser, I choose my friends carefully and my enemies even more carefully.
Those are words for me to live by.