It is in the half fools and the half wise that the greatest danger lies.

He who knows no foreign languages knows nothing of his own.

One that does not think to highly of himself is more than he thinks.

Moral epochs have their course as well as the seasons. We can no more hold them fast than we can hold sun, moon, and stars. Our faults perpetually return upon us; and herein lies the subtlest difficulty of self-knowledge.

The works of Lavoisier and his associates operated upon many of us at that time like the Sun's rising after a night of moonshine: but Chemistry is now betrothed to the Mathematics, and is in consequence grown somewhat shy of her former admirers.

There are two things children should get from their parents: roots and wings.

Beware of dissipating your powers; strive constantly to concentrate them.