Always follow these two rules: first, act only on what your reasoning mind proposes for the good of humanity, and second, change your opinion if someone shows you it's wrong. This change of mind must proceed only from the conviction that it's both correct and for the common good, but not because it will give you pleasure and make you popular.

Be not careless in deeds, nor confused in words, nor rambling in thought.

Nothing that goes on in anyone else's mind can harm you.

The honest and good man ought to be exactly like a man who smells strong, so that the bystander as soon as he comes near him must smell whether he choose or not.

How many together with whom I came into the world are already gone out of it.

Constantly regard the universe as one living being, having one substance and one soul; and observe how all things have reference to one perception, the perception of this one living being; and how all things act with one movement; and how all things are the cooperating causes of all things which exist; observe too the continuous spinning of the thread and the contexture of the web.

Be cheerful, also, and seek not external help, nor the peace which others give. A man must stand straight, and not be kept straight by others.