Are there degrees of reward for believers? Are there different heavens or glories in God's kingdom?

In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
John 14:2

Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward. Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son. If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed.
II John 1:8-10

There is one glory of the sun, and another glory of the moon, and another glory of the stars: for one star differeth from another star in glory. So also is the resurrection of the dead.
I Corinthians 15:41-42

I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth;) such an one caught up to the third heaven.
II Corinthians 12:2

From a simple reading of the above passages, it is readily apparent that there are degrees of reward for believers. Our primary motivation for doing good works should always be our love for the Master, but it is comforting to know that He is a just God who will exercise judgment in an equitable manner.

What a wonderful thought that the Lord is preparing a special place in His kingdom just for you -- one uniquely prepared according to your individual response. In II John, by inference, if there is such a thing as a "full" reward, it is entirely possible that there are rewards that are less than full. True believers will be saved from hell, but I Corinthians 15 and II Corinthians 12 make it clear that there are various heavens and glories in God's kingdom (Ephesians 4:10).