As God rested on the seventh day after He had created the heavens and earth and all that are in them, so shall faithful Christians have a rest at the end of their labors on this earth. The Hebrews were admonished to fear or be aware that they must remain faithful in their obedience to assure that they would not come short of that rest and be eternally lost.
“Today” is an important time in the lives of all men. The writer quoted David as he related a passage from the Psalms; “Today, if you will hear His voice, do not harden your hearts.”
The present is the only time one is assured. If obedience is delayed until “tomorrow,” it could well be too late and God’s rest would be forfeited forever just as it was for the Israelites who sinned in the desert. One may think that he can “sneak into heaven under God’s radar,” but the Hebrews were informed that, “all things are naked and open to the eyes of Him to whom we must give account.”