What is Ananda?

SRI AUROBINDO, Letters on Yoga,
Volume 1, Section Four, REASON, SCIENCE AND YOGA

What is this Ananda, after all? The mind can see in it nothing but a pleasant psychological condition, — but if it were only that, it could not be the rapture which the bhaktas and the mystics find in it. When the Ananda comes into you, it is the Divine who comes into you, just as when the Peace flows into you, it is the Divine who is invading you, or when you are flooded with Light, it is the flood of the Divine himself that is around you. Of course, the Divine is something much more, many other things besides, and in them all a Presence, a Being, a Divine Person; for the Divine is Krishna, is Shiva, is the Supreme Mother.

But through the Ananda you can perceive the Anandamaya Krishna, for the Ananda is the subtle body and being of Krishna; through the Peace you can perceive the Shantimaya Shiva; in the Light, in the delivering Knowledge, the Love, the fulfilling and uplifting Power you can meet the presence of the Divine Mother. It is this perception that makes the experiences of the bhaktas and mystics so rapturous and enables them to pass more easily through the nights of anguish and separation; when there is this soul-perception, it gives to even a little or brief Ananda a force or value it could not otherwise have, and the Ananda itself gathers by it a growing power to stay, to return, to increase.