There is no disgrace in honest failure; there is disgrace in fearing to fail.

My main purpose in life is to make money so I can afford to go on creating more inventions.

No compromise with the main purpose; no peace till victory; no pact with unrepentant wrong.

Everything in life got its purpose, find its reason in every season.

The only way a man can remain consistent amid changing circumstances is to change with them while preserving the same dominating purpose.

The stern compression of circumstances, the twinges of adversity, the spur of slights and taunts in early years, are needed to evoke that ruthless fixity of purpose and tenacious wit without which great actions are seldom accomplished.