O thou of mighty arms where there is nothing to be effected what is the use of resorting to the means for effecting it? O father, it is useless to talk of friend or foe in Govinda, who is identical with all beings, manifest all over the universe, the lord of it and the Great Soul. The Great Vishnu exists in thee, in me as well as in all other creatures; and then what is the use of making such distinction as he is friend and he is foe!

In plain words: Prahlada explains why. Vishnu, also called Govinda, lives in his father, in Prahlada himself and in every creature. So it makes no sense to divide people into friends and foes.