Lotuses are symbols of purity and 'spontaneous' generation and hence symbolize divine birth. According to the Lalitavistara, 'the spirit of the best of men is spotless, like the new lotus in the [muddy] water which does not adhere to it', and, according to esoteric Buddhism, the heart of the beings is like an unopened lotus: when the virtues of the Buddha develop therein the lotus blossoms. This is why the Buddha sits on a lotus in bloom. In Tantrism, it is the symbol of the feminine principle. The lotuses are usually differentiated by their colour and grouping, in three or five flowers, which may or may not be combined with leaves.