A more sure word of prophecy

Hebrews 4:1-11 KJV Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it. [2] For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it . [3] For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world. [4] For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works. [5] And in this place again, If they shall enter into my rest. [6] Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief: [7] Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts. [8] For if Jesus had given them rest, then would he not afterward have spoken of another day. [9] There remaineth therefore a rest to the people of God. [10] For he that is entered into his rest, he also hath ceased from his own works, as God did from his. [11] Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.