Therefore, since the promise of entering his rest still stands, let us be careful that none of you be found to have fallen short of it. Hebrews 4:1 NIV
What causes people to not enter His rest? It seems unbelievable that someone would stop short of entering God’s rest. Like a mountain climber turning back a few meters short of the top, it doesn’t make sense. That’s where the second part of the verse comes in:
For we also have had the gospel preached to us, just as they did; but the message they heard was of no value to them, because those who heard did not combine it with faith. Hebrews 4:1-2 NIV
Entering God’s rest happens when we trust Him. You can’t enter His rest unless you stop trying to do it your way, and trust Jesus––following His way.
Then Jesus said, “Come to me, all of you who are weary and carry heavy burdens, and I will give you rest. Take my yoke upon you. Let me teach you, because I am humble and gentle at heart, and you will find rest for your souls. For my yoke is easy to bear, and the burden I give you is light.” Matthew 11:28-30 NLT
So trust Him and enter.