The further knowledge advances, the nearer we come to the unfathomable: the more we know how to use our knowledge, the better we see that the unfathomable is of no practical use.
The finest achievement for a man of thought is to have fathomed what may be fathomed, and quietly to revere the unfathomable.
The discerning man who acknowledges his limitations is not far off perfection.
There are two things of which a man cannot be careful enough: of obstinacy if he confines himself to his own line of thought; of incompetency, if he goes beyond it.
Incompetency is a greater obstacle to perfection than one would think.