I can, therefore I am.

It's always too early to quit.

You never know what motivates you.

The dog that trots about finds a bone.

Begin to be now what you will be hereafter.

Be thine own palace, or the world's thy jail.

What you do today can improve all your tomorrows.

Well done is better than well said.

The most effective way to do it, is to do it.