1.  always be kind to people ..maybe his day was'nt the best day in his life and maybe your sweetness will make him happy 

2. Maybe if you start accepting others ; never critiquise their favorite type of music;food;colors;shoes;.....  And care about them..they will do the same ...everything is not only about you...it's sad but true !  people are diffrent! and that what makes them special

3. try to keep your mind clear

4. be optimistic!

5. ''A mans success isn't measured by the depths of his pockets but the wiseness of his mind.''