SB 10.20.21

The word pāda means foot, and pā means drinking. Trees are called pādapa because they drink through their roots, which are likened to feet. Upon drinking the newly fallen rainwater, the trees in Vṛndāvana began to manifest new leaves, sprouts and blossoms, and they thus enjoyed new growth. Similarly, materialistic persons often perform severe austerities to acquire the object of their desire. For example, politicians in America undergo grueling austerities while traveling about the countryside campaigning for election. Businessmen also will often deny personal comfort to make their business successful. Such austere persons, upon acquiring the fruits of their austerity, again become healthy and satisfied, like trees eagerly drinking rainwater after enduring the austerity of a dry, hot summer.