Worry clogs the brain and paralyzes the thought. A troubled brain can not think clearly, vigorously, locally.

But how shall I get ideas? ''Keep your wits open! Observe! Observe! Study! Study! But above all, Think! Think! And when a noble image is indelibly impressed upon the mind - Act!

There is no law by which one can, as long as he thinks he can't.

To think you can creates the force that can.