It is surprising what a man can do when he has to, and how little most men will do when they don't have to.

The first virtue in a soldier is endurance of fatigue; courage is only the second virtue.

The happiness of your life depends upon the quality of your thoughts. So think happy and positive. Good Morning!

Logic will get you from A to B. Imagination will take you everywhere.

It surprises me how disinterested we are today about things like physics, space, the universe and philosophy of our existence, our purpose, our final destination. It's a crazy world out there. Be curious.

Don't use your phone in bed tonight.

The more brilliant the lightning, the quicker it disappears.