By His prophet Isaiah God tells us,

Incline your ear, and come to Me. Hear, and your soul shall live; and I will make an everlasting covenant with you - the sure mercies of David.

Isaiah 55:3 - NKJV

Our New Covenant is between God and His Son, Jesus. We have part in it because we are the Body of Christ and we are the generation of Jesus Christ - the seed that Jesus has generated. Peter calls us a chosen generation. 1 Peter 2:9. In Psalm 89 we read God saying,

I have made a covenant with My chosen, I have sworn to My servant David; Your seed I will establish forever, And build up your throne to all generations. Also I will make him My firstborn (Jesus is the firstborn from the dead! - Revelation 1:5.), The highest of the kings of the earth. My mercy I will keep for him forever, And My covenant shall stand firm with him.

Psalm 89:3-4,27-28 - NKJV

For this reason the New Covenant is of a different order than the Old Covenant. The Old Covenant was made with man - when man broke it the Covenant was invalidated and the punishment was death. The New Covenant stands eternally ours, never to be removed and ever available to ensure peace.

For the mountains shall depart, and the hills be removed; but my kindness shall not depart from thee, neither shall the covenant of my peace be removed, saith the LORD that hath mercy on thee.

Isaiah 54:10 - KJV

It is by this covenant that we have God's protection, provision and promotion. The New Covenant is God's Covenant of Peace and as such, by implication, His covenant of prosperity for all His people.

What could have motivated the Almighty God creator of heaven and earth to bring us into such a covenant with Himself as this? It was His love! God by Jesus brought you and me into covenant with Himself because of His immeasurable love for us! John 3:16.