It is not God, but people themselves who shorten their lives by not keeping physically fit.

A professor can never better distinguish himself in his work than by encouraging a clever pupil, for the true discovers are among them, as comets amongst the stars.

Blessed be the Lord for the beauty of summer and spring, for the air, the water, the verdure, and the song of birds.

When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins.

In natural science the principles of truth ought to be confirmed by observation.

There is no generation from an egg in the Mineral Kingdom. Hence no vascular circulation of the humours as in the remaining Natural Kingdoms.

This drink has a magical power. It strengthens the weak, and revives those who have fainted. Those tired after work and physical activity can return their life forces by this drink much sooner than by nourishment. ... It works as a diuretic, an appetizer, an antitoxin.