Violence, attachment, covetousness and wrath," says Guru Nanak "are like four rivers of fire; those who fall in them burn, and can swim across, O Nanak, only through God's grace" (GG, 147).
Elsewhere He says, "Kam and krodh dissolve the body as borax melts gold" (GG, 932).
Guru Arjan, Nanak V, censures krodh in these words: "O krodh, thou enslavest sinful men and then caperest around them like an ape."