What’s one thing someone, anyone, once said to you that has remained with you for the rest of your life? (Can be negative or positive)

I’ll go first. I was told I was useless and wouldn’t make something of myself by my bitch teacher, she was actually my motivation to work my hardest - because I wanted to prove her wrong. This morning I got promoted as a senior in my position at work. I took it upon myself to find her on Facebook, let her know how wrong she was and she apologised. Bitch.