by them. in them. Hebrew. bahem, as in Psalms 19:4, going about the Scriptures, moving and dwelling in the written Word, as the sun does in the heavens. (Compare 1 Timothy 4:15; 1 Timothy 3:14.)
warned. enlightened; hence, taught or admonished.
keepings. observing, or watching; as observers watch the heavenly bodies. Compare Psalms 130:6; Isaiah 21:11).
there is great reward. great [is] the reward.