I can, therefore I am.

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

The dog that trots about finds a bone.

To know oneself, one should assert oneself.

It's always too early to quit.

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

Go for it now. The future is promised to no one.

Always desire to learn something useful.

Be gentle to all and stern with yourself.