The only school of genuine moral sentiment is society between equals. J. S. Mill.
The only serious and formidable thing in Nature is will. Emerson.
The only sin which we never forgive in each other is difference of opinion. Emerson.
The only solid instruction is that which the pupil brings from his own depths; the true instruction is not that which transmits notions wholly formed, but that which renders him capable of forming for himself good opinions. Degerando.
The only substance properly so called is the 20 soul. Amiel.
The only teller of news is the poet. Emerson.
The only thing grief has taught me is to know how shallow it is. Emerson.
The only true principle for humanity is justice. Amiel.
The only true source of politeness is consideration. Simms.
The only victory over love is flight. Napoleon. 25