Hiraṇyakaśipu, once powerful and invincible with the new boon, began to persecute those who were devotees of Vishnu. Hiraṇyakaśipu had a son, Prahlāda, who disagreed and rebelled against his father. Prahlāda became a devotee of Vishnu. This angered Hiraṇyakaśipu, who tried to kill the boy—but with each attempt, Prahlāda was protected by Viṣṇu's mystical power. When asked, Prahlāda refused to acknowledge his father as the supreme lord of the universe and claimed that Viṣṇu is all-pervading and omnipresent.