The mind once enlightened cannot again become dark.

He who dares not offend cannot be honest.

The study of theology, as it stands in Christian churches, is the study of nothing; it is founded on nothing; it rests on no principles; it proceeds by no authorities; it has no data; it can demonstrate nothing; and it admits of no conclusion. Not anything can be studied as a science, without our being in possession of the principles upon which it is founded; and as this is the case with Christian theology, it is therefore the study of nothing.

Perhaps the most valuable result of al education is the ability to make yourself do the thing you have to do, when it ought to be done, whether you like it or not.

Knowledge comes, but wisdom lingers.

Thought is the labour of the intellect, reverie is its pleasure.