But even if we accept this pure Existence, this Brahman, this Sat as the absolute beginning, end and continent of things and in Brahman an inherent self-consciousness inseparable from its being and throwing itself out as a force of movement of consciousness which is creative of forces, forms and worlds, we have yet no answer to the question “Why should Brahman, perfect, absolute, infinite, needing nothing, desiring nothing, at all throw out force of consciousness to create in itself these worlds of forms?” For we have put aside the solution that it is compelled by its own nature of Force to create, obliged by its own potentiality of movement and formation to move into forms. It is true that it has this potentiality, but it is not limited, bound or compelled by it; it is free. If, then, being free to move or remain eternally still, to throw itself into forms or retain the potentiality of form in itself, it indulges its power of movement and formation, it can be only for one reason, for delight.
Delight of Existence, Life Divine, CWSA, Sri Aurobindo.