Do not fall into the very common error of believing that you must sit in an absolutely quiet corner where nobody passes by, where you are in a classical position and altogether immobile, in order to be able to meditate — it is not true. What is needed is to succeed in meditating under all circumstances, and I call “meditating” not emptying your head but concentrating yourself in a contemplation of the Divine; and if you keep this contemplation within you, all that you do will change its quality — not its appearance, for apparently it will be the same thing, but its quality. And life will change its quality, and you, you will feel a little different from what you were, with a peace, a certitude, an inner calm, an unchanging force, something which never gives way.
In that state it will be difficult to do you harm—the forces always try, this world is so full of adverse forces which seek to upset everything… but they succeed in a very small measure, only in the measure necessary to force you to make a new progress.
Each time you receive a blow from life, tell yourself immediately, “Ah, I have to make a progress”; then the blow becomes a blessing. Instead of tucking your head between your shoulders, you lift it up with joy and you say, “What is it I have to learn? I want to know. What is it I have to change? I want to know.”
This is what you should do.
Ref: Questions and Answers 1950 – 1951