Though sleep is called our best friend, it is a friend who often keeps us waiting!

Well, my friend, this earth will one day be that cold corpse; it will become uninhabitable and uninhabited like the moon, which has long since lost all its vital heat.

Before all masters, necessity is the one most listened to, and who teaches the best.

When science has sent forth her fiat - it is only to hear and obey.

'Movement is life;' and it is well to be able to forget the past, and kill the present by continual change.

In presence of Nature's grand convulsions, man is powerless.