A person’s drive is often based on what he or she believes about their abilities, not on how objectively talented they are. 

A research has shown that people who have perceived self-efficacy (that is, the belief that they can accomplish what they set out to do) perform better than those who don’t. 

And, put your needs first, even if they seem a little selfish. You will progress better if you stop sacrificing something for others (for example, by eating a cake with your colleague while you’re on a diet). 

“Stay away from those people who try to disparage your ambitions. Small minds will always do that, but great minds will give you a feeling that you can become great too.” — Mark Twain