Have Faith & Don't Harden Your Heart

Hebrews 4 (From www.biblegateway.com)

A Sabbath-Rest for the People of God

 1Therefore, 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. 2For 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. 3Now we who have believed enter that rest, just as God has said,    "So I declared on oath in my anger,    'They shall never enter my rest.' "And yet his work has been finished since the creation of the world. 4For somewhere he has spoken about the seventh day in these words: "And on the seventh day God rested from all his work." 5And again in the passage above he says, "They shall never enter my rest."
 6It still remains that some will enter that rest, and those who formerly had the gospel preached to them did not go in, because of their disobedience. 7Therefore God again set a certain day, calling it Today, when a long time later he spoke through David, as was said before:    "Today, if you hear his voice,       do not harden your hearts."