Do not boast about tomorrow, for you do not know what a day may bring.

All progress is based upon a universal, innate desire on the part of every organism to live beyond its income.

It would be madness, and inconsistency, to suppose that things which have never yet been performed can be performed without employing some hitherto untried means.

My interest is in the future, because I am going to spend the rest of my life there.

Destiny is not a matter of chance, it is a matter of choice; it is not a thing to be waited for, it is a thing to be achieved.