The System of the Vedanta according to Badarayana's Brahma-Sutras and Cankara's Commentary c7.s2.t3.3

c7.s2.t3.3

It might be objected that it is not feasible to assume the spiritual Brahman alone and without a second as the cause of the world, because in order to mould anything, all kinds of instruments are needed; thus in actual life the potters etc. when they wish to make vessels take all kinds of things, as the clay, the stick, the wheel, or thread as instruments, and thus we cannot assume that Brahman created the world without instruments. We reply to this, that creation takes place by the specific quality of the substance (dravya-svabhâva-viçeshâd, that is, Brahman) in much the same way that the change of milk into curds or water into ice takes place without exterior instruments. Certainly warmth assists in turning milk sour, still the milk follows nothing but the laws of change inherent in itself, and the process is only hastened by the warmth. Were the power to become sour not already in the milk, the warmth could not help it to change; since, for example, wind or ether cannot be changed to curds by warmth. The addition of the means only completes the process; but even such a completion is not needed in the case of Brahman, for he possesses all the necessary powers (*çakti* of which immediately) perfect within himself.