The time will come when diligent research over periods will bring to light things which now lie hidden...Many discoveries are reserved for ages still to come, when memories of us will have been effaced. Our universe is a sorry little affair unless it has something for every age to investigate. nature does not reveal her mysteries once and for all.

He who begs timidly courts a refusal.

Slavery takes hold of few, but many take hold of slavery.

The expression of truth is simplicity.

Necessity is stronger than duty.

Success gives the character of honesty to some classes of wickedness.

It is another's fault if he be ungrateful, but it is mine if I do not give. To find one thankful man, I will oblige a great many that are not so.