Посему мы должны быть особенно внимательны к слышанному, чтобы не отпасть.
We must pay the most careful attention, therefore, to what we have heard, so that we do not drift away.
Therefore we must pay much closer attention to what we have heard, lest we drift away from it.
For this reason we must pay much closer attention to what we have heard, so that we do not drift away from it.
So we must listen very carefully to the truth we have heard, or we may drift away from it.
Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.
Therefore we must give [a]the more earnest heed to the things we have heard, lest we drift away.
For this reason we should give heed more abundantly to the things [we have] heard, lest in any way we should slip away.