Cheerfulness: a joyous smile of Nature.
Cheerful endeavour: the joy that one finds in the effort towards the Divine.
Mental cheerfulness: it knows how to take delight in everything.
Keep a cheerful mind and a peaceful heart. Let nothing disturb your equanimity and make every day the necessary progress to advance with me steadily towards the goal.
The Mother – Words of the Mother – II: CWM, Vol. 14, p. 179
It is that cheerfulness that we want to be always there in you. It is the happiness of the psychic that has found its way and, whatever difficulties come, is sure that it will be led forward and reach the goal. When a sadhak has that constantly, we know that he has got over the worst difficulty and that he is now firmly on the safe path.
Sri Aurobindo – Letters On Yoga – IV: CWSA, Vol. 31, p. 173
Generally speaking, man is an animal who takes himself terribly seriously. To know how to smile at oneself in all circumstances, to smile at one’s sorrows and disillusions, ambitions and sufferings, indignation and revolt―what a powerful weapon with which to overcome oneself!
The Mother – Words of the Mother – II: CWM, Vol. 14, p. 177