I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.

The only thing we have power over in the universe is our own thoughts.

I can doubt everything, except one thing, and that is the very fact that I doubt. Simply put - I think, therefore I am

Divide each difficulty into as many parts as is feasible and necessary to resolve it.

An optimist may see a light where there is none, but why must the pessimist always run to blow it out?

It is best not to go on for great quest for truth , it will only make you miserable

The greatest minds are capable of the greatest vices as well as of the greatest virtues.