Thus the labour of a manufacture adds, generally, to the value of the materials which he works upon, that of his own maintenance, and of his masters profits. The labour of a menial servant, on the contrary, adds to the value of nothing.
All partisan movements add to the fullness of our understanding of society as a whole. They never detract; or, in any case, one must not allow them to do so. Experience adds to experience.
Be always displeased with what you are if you wish to be what you are not. Always add, always walk, always proceed. Neither stand still nor go back nor deviate.