Romans 11:22-12:2 (New King James Version)
"Therefore consider the goodness and severity of God: on those who fell, severity; but toward you, goodness, if you continue in His goodness. Otherwise you also will be cut off. And they also, if they do not continue in unbelief, will be grafted in, for God is able to graft them in again. For if you were cut out of the olive tree which is wild by nature, and were grafted contrary to nature into a cultivated olive tree, how much more will these, who are natural branches, be grafted into their own olive tree? For I do not desire, brethren, that you should be ignorant of this mystery, lest you should be wise in your own opinion, that blindness in part has happened to Israel until the fullness of the Gentiles has come in. And so all Israel will be saved, as it is written: “The Deliverer will come out of Zion, And He will turn away ungodliness from Jacob; For this is My covenant with them, When I take away their sins.” Concerning the gospel they are enemies for your sake, but concerning the election they are beloved for the sake of the fathers. For the gifts and the calling of God are irrevocable. For as you were once disobedient to God, yet have now obtained mercy through their disobedience, even so these also have now been disobedient, that through the mercy shown you they also may obtain mercy. For God has committed them all to disobedience, that He might have mercy on all. Oh, the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments and His ways past finding out! “ For who has known the mind of the LORD? Or who has become His counselor? Or who has first given to Him and it shall be repaid to him?” For of Him and through Him and to Him are all things, to whom be glory forever. Amen.
I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God."
"The gifts and the callling of God are irrevocable" (Romans 11:29). When God makes a promise to us, He does not go back on His word. He will carry it through. We can always trust Him to do as He says. Like Israel of old who trusted God to send a deliverer to save them from their sins, so do we now trust Him to save us from our sins. Therefore, the most reasonable thing we can do is to give our lives over to Him. We need to present our bodies to Him as a living sacrifice, set apart for holiness. In the same way that we trust Him with His promises, we can trust Him with our lives. Let us therefore not be quick to conform to the standards of this world, which by the way, cares nothing for us, but let us rather conform ourselves to the will of God.