What can keep you from entering the rest of God? Will you allow it? There remains a rest for all who will endure till the end. The prize for enduring till the end is great so also the consequence of not enduring till the end. Interestingly, what you get at the end is YOUR choice. This post stresses heart of unbelief as what will hinder you from entering the rest of God and encourages you to stop it before it stops you.
Therefore I was angry with that generation, and said, 'They always go astray in their heart, and they have not known My ways.' So I swore in My wrath, 'They shall not enter My rest.' Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God... So we see that they could not enter in because of unbelief - Hebrews 3:10-19 (NKJV).
For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life - John 3:16 (NKJV).
God is preparing a place for all who believe in His son, who walk, not according to the dictates of this world, but according to God's principles (Romans 8:1,5). The main principle being that you should not harbour unbelief in your heart, God calls it 'evil'! It is evil to doubt God's words for your everyday life, not to believe in His Son, or not to believe that what He said is what will happen.
Whenever you hear God's voice while reading the scriptures, listening to preachers and teachers, and testimonies, or watching Christian movies, the Lord admonishes that you should not harden your heart and have an evil heart of unbelief. You are to believe that it is God speaking to you (1 Thessalonians 2:13) and applying it immediately in your life. You are not to reason out how it could be or how it will happen (Proverbs 3:5-7), that is not your part to do or your responsibility. Your part is to believe it till the end, finish.
Hold unto God's word till the end, He never fails. You can never do better than God even if you tried, you will only compound your problems or issues by being wise in your own eyes. Let go and let God. In Job 14:14, Job said he would wait till his change comes. Did his change come? Surely it did. He refused to sin against God and God changed his story and his latter end was better than his former.
Also, in Daniel 3, the three Hebrew boys held unto God to deliver them till the end and God delivered them. They were ready to believe God till the end even if it meant them dying; that is the attitude God wants you to have - truly believing God to the end even if it will cost you your life, not having any atom of doubt in your heart.
People err in their hearts because God's words are inadequate in their hearts and so sin deceives them and breeds unbelief in them. You keep unbelief far from you by loading yourself with God's words and obeying them. You are to do exactly what God says you should do, not adding or subtracting anything. As Mary instructed the servants, 'whatever He tells you to do, do it'. The servants obeyed. They filled the pot with water, and drew from the same pot and gave the master of ceremony, asking no questions. In obedience to the Lord's instructions (which was 'un-think of' in the minds of men), the servants witnessed a miracle (John 2:1-11)!
In conclusion, there is eternal rest prepared for you, but you are the one who decides whether to enter or not. Heeding to God's words, no matter what, will get you into this rest. Decide today to follow Christ like a sheep, questioning nothing, having no evil heart of unbelief and you will see the glory of God upon your life.