Deuteronomy 33 was obviously written far before the birth of Jesus, but I found a passage that felt very much like it could have fit into the New Testament with a few modifications.
Deu 33:29 Happy art thou, O Israel: who is like unto thee, O people saved by the LORD, the shield of thy help, and who is the sword of thy excellency! and thine enemies shall be found liars unto thee; and thou shalt tread upon their high places.
The modification that I was referring to is obviously the fact that we can all be people saved by the Lord now. The gift of salvation is available to Jews and Gentiles.
Because of the similarity, I think that we can see a very important truth. We are people saved by the Lord, so we should be happy. We all try to pursue happiness in a variety of ways, but God is the only one who can provide unlimited and eternal happiness.
Isa 58:11 And the LORD shall guide thee continually, and satisfy thy soul in drought, and make fat thy bones: and thou shalt be like a watered garden, and like a spring of water, whose waters fail not.
Now, if we combine my previous thought with this verse from Isaiah, it is possible to conclude that the happiness that we receive from being a child of God is also satisfaction.
I think that this is an important distinction.
In earthly terms, there are always more things that we could want. We might want a new house, a new car or really anything else.
However, when we are saved by God, we have all of God that we will ever have. We will definitely learn to recognize the will of God more strongly, but God is with us all the time. It is not like we can want to have more of Him. That is why God can be satisfying.
So, even though the verse I gave you from Deuteronomy was speaking to the children of Israel, we can think about the same thing today. God brings us happiness, and we should not be trying to find that same feeling anywhere else.