By the experience of active love. Strive to love your neighbour actively and indefatigably. In as far as you advance in love you will grow surer of the reality of God and of the immortality of your soul. If you attain to perfect self-forgetfulness in the love of your neighbour, then you will believe without doubt, and no doubt can possibly enter your soul. This has been tried. This is certain.

Humiliate the reason and distort the soul.

Nothing could be more absurd than moral lessons at such a moment! Oh, self-satisfied people: with what proud self-satisfaction such babblers are ready to utter their pronouncements! If they only knew to what degree I myself understand all the loathsomeness of my present condition, they wouldn't have the heart to teach me.

A new philosophy, a new way of life, is not given for nothing. It has to be paid dearly for and only acquired with much patience and great effort

Twice two makes four seems to me simply a piece of insolence. Twice two makes four is a pert coxcomb who stands with arms akimbo barring your path and spitting. I admit that twice two makes four is an excellent thing, but if we are to give everything its due, twice two makes five is sometimes a very charming thing too.

Every man looks out for himself, and he has the happiest life who manages to hoodwink himself best of all.

Never mind a little dirt, if the goal is splendid!