'Belief' in the Bible

My brothers, take care that there is not by chance in any one of you an evil heart without belief, turning away from the living God:

So we see that they were not able to go in because they had no belief.

For those of us who have belief come into his rest; even as he has said, As I said in my oath when I was angry, They may not come into my rest: though the works were done from the time of the making of the world.

And without faith it is not possible to be well-pleasing to him, for it is necessary for anyone who comes to God to have the belief that God is, and that he is a rewarder of all those who make a serious search for him.

[looking away from all that will distract us and] focusing our eyes on Jesus, who is the Author and Perfecter of faith [the first incentive for our belief and the One who brings our faith to maturity], who for the joy [of accomplishing the goal] set before Him endured the cross, disregarding the shame, and sat down at the right hand of the throne of God [revealing His deity, His authority, and the completion of His work].