Luck

Luck is where preparation meets opportunity.
Seneca

Experience

Experience is what you get when you don’t get what you want.
Unknown source (to me)

La experiencia es un peine que te dan cuando te quedas pelado.
Oscar 'Ringo' Bonavena

Leg & Tail

How many legs does a dog have if you call the tail a leg? Four. Calling a tail a leg doesn't make it a leg.
Abraham Lincoln

Ambiciones

You can't always get what you want
But if you try sometimes you might just find
You get what you need
Rolling Stones

When you see your neighbor carryin' somethin',
Help him with his load,
And don't go mistaking Paradise
For that home across the road.
Bob Dylan

Progress

"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man."
George Bernard Shaw