By His Divine Grace A.C.B. Swami Prabhupada
So when Vamanadeva appeared, Bali Maharaja was attracted by His beauty as a Dwarf Brahmin, and as he was charitably disposed, he wanted to give Him some charity. But Sukaracharya, being elevated in mystic yogic powers, he could understand that Vamanadeva was Visnu. And in order to favor the demigods, He had come there to cheat Bali Maharaja in the shape of begging some charities. Bali Maharaja was puffed up with his material vanities, and Vamanadeva as He is Visnu, all-peaceful, without interrupting his attitude, just approached him in the form of a Brahmin, Who has a right to beg something from the princely order. And the principle orders also are always disposed, to make charities to the Brahmins.