Success is a lousy teacher. It seduces smart people into thinking they can't lose.
Most people overestimate what they can do in one year and underestimate what they can do in ten years.
Life is not fair get used to used to it
Before you were born, your parents weren't as boring as they are now. They got that way from paying your bills, cleaning your clothes and listening to you talk about how cool you thought you were. So before you save the rain forest from the parasites of your parent's generation, try delousing the closet in your own room.
Just in terms of allocation of time resources, religion is not very efficient. There's a lot more I could be doing on a Sunday morning.
Your most unhappy customers are your greatest source of learning.
The great thing about a computer notebook is that no matter how much you stuff into it, it doesn't get bigger or heavier.