On his journey between Thebes and Delphi, Oedipus encounters the Sphinx—in order to pass, he must answer the Sphinx’s riddle: "What walks on four feet in the morning, two in the afternoon and three at night?". Oedipus’s answer is: "Man: as an infant, he crawls on all fours; as an adult, he walks on two legs and; in old age, he uses a walking stick".
In the Rig Veda, a riddle similar to the one posed by the Sphinx can be found in verse 10.117.8: “He with one foot hath far outrun the biped, and the two-footed catches the three-footed. Four-footed creatures come when bipeds call them, and stand and look where five are met together.”
This verse preaches that quantity is not the measure of power and effectiveness, because the more feet an entity has, the less autonomous and effective it is. The one-footed in the verse is the sun; the two-footed is a man; the three-footed is an old man who walks with the help of a stick; the four-footed is a dog; and the five-footed are the herds.