He who pays no attention to what his neighbor does, says or thinks, preferring to concentrate on making his own actions appropriate and justifiable, better uses his time.

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.

We are born for cooperation, as are the feet, the hands, the eyelids, and the upper and lower jaws.

As surgeons keep their instruments and knives always at hand for cases requiring immediate treatment, so shouldst thou have thy thoughts ready to understand things divine and human, remembering in thy every act, even the smallest, how close is the bond that unites the two.

Letting go all else, cling to the following few truths. Remember that man lives only in the present, in this fleeting instant: all the rest of his life is either past and gone, or not yet revealed. This mortal life is a little thing, lived in a little corner of the earth; and little, too, is the longest fame to come - dependent as it is on a succession of fast-perishing little men who have no knowledge even of their own selves, much less of one long dead and gone.

...the sole thing of which any man can be deprived is the present; since this is all he owns, and nobody can lose what is not his.

The time is at hand when you will have forgotten everything; and the time is at hand when all will have forgotten you. Always reflect that soon you will be no one, and nowhere.