Although personally I am quite content with existing explosives, I feel we must not stand in the path of improvement. 

The end of labor is to gain leisure.

The best thinking has been done in solitude. The worst has been done in turmoil.

Work out your own salvation. Do not depend on others.

Forget the past.

There are only two mistakes one can make along the road to truth; not going all the way, and not starting.

Old friends pass away, new friends appear. It is just like the days. An old day passes, a new day arrives. The important thing is to make it meaningful: a meaningful friend - or a meaningful day.

Those that know, do. Those that understand, teach.

I never think of the future - it comes soon enough.

Nothing can be more abhorrent to democracy than to imprison a person or keep him in prison because he is unpopular. This is really the test of civilization. 

The best argument against democracy is a five-minute conversation with the average voter. 

If you are part of a false propaganda machinery, you are fighting for the wrong cause.