“God is not a man that He should lie” Numbers 23:19
The basis of all the covenants that God has ever made is that He speaks the truth with no hidden agenda. To doubt or reject God’s word is to call Him a liar. An example of this can be seen in Romans 3:10 where Paul writes, quoting from Psalm 14, “There is none righteous, no, not one” and in 3:23, “All have sinned and fall short of the glory of God.” There are those who reject these truths and thus call God a liar. John writes as much in his letter, “If we say that we have not sinned, we make Him a liar, and His word is not in us” (1 John 1:10).
Jesus claimed to be Truth (John 14:6; cf. 1:17; 8:32) and God’s word to be truth (John 17:17). In so doing He was saying that God does not lie and therefore His word can be relied upon. Men do lie so when it comes to a choice whose word are we going to believe?
In his greeting to Titus, Paul states clearly that God cannot lie (Titus 1:2). The best a man can say is that he is not lying or will not lie but he cannot truthfully say that he cannot lie. Paul gives us the reason God cannot lie in 2 Timothy 2:13, “He cannot deny Himself.” What this means is that God always speaks and acts according to His Divine Nature. We can observe this in His Creation. All creatures and plants conform to their kind and can do nothing else. In breeding animals and growing crops we rely on this fact.
When it comes to God’s covenants and promises we can rely on them because God cannot lie. If we create an image of God in our minds that is like people we will not be inclined to believe His word. As such we call Him unfaithful and a liar. Jesus said that Satan is a liar and the father of lies (John 8:44). He lied to Eve (Genesis 3:5) and he has been lying to people ever since.
In creating us in His image God has given us free will to make our own choice. We can choose to believe God or we can choose to believe Satan. Our choice will determine the course and destiny of our lives. Believe God to eternal life (John 5:24) or believe Satan’s lie to eternity in the “lake of fire and brimstone” to be “tormented day and night forever and ever” (Revelation 20:10). We are choosing to be either in Christ’s presence or Satan’s.