"Take advantage of five things before five things seize you; Your youth before your old age, Your health before your sickness, Your wealth before your poverty, Your spare time before your being busy and Your life before you death." Muhammad (Peace be upon him.)
It wasn't advice to me but: ""You either walk around like you own the world, or you walk around like the world owns you." -redeye
Also not to me but:
"If you are caught unprepared by a sudden rainstorm, you should not run foolishly down the road or hide under the eves of houses. You are going to get soaked either way. Accept that from the beginning and go on your way. This way you will not be distressed by a little rain. Apply this lesson to everything."
The advice itself is not that amazing, but it opened my eyes in a way. I used to be quite self-conscious and felt that I was often to blame if a conversation went stale. The advice I got was: "What other people think about you, is none of your damn business". This really stuck with me, as I never thought about it that way. I shouldn't worry about what others think about me, that is their thing to worry about. I should try to be the best I can be, but without worrying about being judged by others.
I"m not sure if this is the best advice I've received but it's what I remember most. I was probably 11 or 12 years old and I remember telling my dad that I was thinking about wanting to be a mechanic like him when I grew up and he told me no. The reason being is he wanted me to do a job that required me to use my head and not my body. He wanted more for me than what he had and I'm so grateful for that.