It is only effort, in whatever domain it be—material effort, moral effort, intellectual effort—which creates in the being certain vibrations which enable you to get connected with universal vibrations; and it is this which gives joy. It is effort which pulls you out of inertia; it is effort which makes you receptive to the universal forces. And the one thing above all which spontaneously gives joy, even to those who do not practise yoga, who have no spiritual aspiration, who lead quite an ordinary life, is the exchange of forces with universal forces. People do not know this, they would not be able to tell you that it is due to this, but so it is.
Ref: Questions and Answers 1950-1951