When a child can be brought to tears, not from fear of punishment, but from repentance for his offence, he needs no chastisement. When the tears begin to flow from grief at one's own conduct, be sure there is an angel nestling in the bosom.

Those who exert the first influence upon the mind have the greatest power.

Knowledge is but an instrument, which the profligate and the flagitious may use as well as the brave and the just.

Knowledge is a mimic creation.

Astronomy is one of the sublimest fields of human investigation. The mind that grasps its facts and principles receives something of the enlargement and grandeur belonging to the science itself. It is a quickener of devotion.

Be ashamed to die until you have won some victory for humanity.

When will society, like a mother, take care of all her children?