There is no common measure between us.

I cannot proceed step by step..

It is a truth of a nature absolutely incapable of demonstration.

All that I can say is, that the wisest and best men in all ages had agreed in giving the preference, very greatly, to the pleasures of intellect; and that my own experience completely confirmed the truth of their decisions; that I had found sensual pleasures vain, transient, and continually attended with tedium and disgust; but that intellectual pleasures appeared to me ever fresh and young, filled up all my hours satisfactorily, gave a new zest to life, and diffused a lasting serenity over my mind.

If he believe me, it can only be from respect and veneration for my authority.