I think quotes are great, here are two;
Time is a great teacher, sadly, it kills all its pupils - someone, I forget >.<
This is a funny quote and it stays with me because time is a great teacher; we learn new things every day, but we die. So yeah, it's a great teacher, but hey, it shot me. POOM! (Pachow, whichever XD)
And the next one is one I personally favour;
Life is like an apple; people will only choose you if you look good on the outside - Myself (no, seriously)
This quote sticks true to me because loads of people will only like you by the way you look, they don't go for personality until later on. So if you look bad on the outside but you're really good on the outside, or maybe you're good looking on the outside, but bad on the inside. There's my philosophy on life. We are APPLES! (HAPPLES!)