'Themselves' in the Bible

Yet these men are abusive in matters of which they know nothing, and in things which, like the brutes, they understand instinctively--in all these they corrupt themselves.

These men--sunken rocks! --are those who share the pleasure of your love-feasts, unrestrained by fear while caring only for themselves; clouds without water, driven away by the winds; trees that cast their fruit, barren, doubly dead, uprooted;