1.) Dream as if you'll live forever. Life as if you'll die tomorrow.
                          - James Dean

This means you shouldn't waste your life because you never know how long you have.

2.) It's all mind over matter. If you don't mind, it doesn't matter.

                   - Albert Einstein

 This means you shouldn't overthink things because then you'll worry too much.

3.) Remember, no one can make you feel inferior without your consent.  - Eleanor Rooselvelt

This is saying to stick up for yourself and don't let anyone push you around or tell you you're something your not.