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.

Whether one showed you and execution or a little finger, you would extract an equally edifying thought from both of them, and would still be content. That's the way to get on in life.

How many ideas have there been in the history of man which were unthinkable ten years before they appeared?

Know that I've forgotten precisely nothing; but I've driven it all out of my head for a time, even the memories--until I've radically improved my circumstances. Then...then you'll see, I'll rise from the dead!

I don’t understand anything...and I no longer want to understand anything. I want to stick to the fact...If I wanted to understand something, I would immediately have to betray the fact, but I’ve made up my mind to stick to the fact.

He who masters the grey everyday is a hero.

What matters," said the prince at last, "is that you have a child's trusting nature and extraordinary truthfulness. Do you know that a great deal can be forgiven you for that alone?