We must be careful not to be insincere about trying to enter the place of eternal rest.

Hebrews 4:11-13

11 God severely punished the Israelites because they disbelieved his message. So we must strive to experience entering that place of resting eternally, in order that he will not severely punish any of us for not believing his message. 12 Beware of being insincere about doing this, because the message God has given us very powerfully penetrates our thinking more than a two-edged sword penetrates flesh [MET]. It penetrates deeply into our souls and spirits, as a sharp sword can penetrate into our joints and marrow. That is, by his message God [PRS] discerns all that we think about, and he discerns all that we desire to do [MTY] (OR, His message exposes to us all our thoughts and all our desires). 13 God knows everything about everyone. Everything is completely exposed [DOU] to him, and he is the one [SYN] who will say whether he approves of what we have done.