To maintain that Scripture teaches that God changes in His nature, plans, purposes, or will, is to ignore the plain, straightforward, unqualified, and didactic teaching on the immutability of God in both testaments, both explicit and by implication. Passages which seem to teach a change of mind in God must be interpreted either as 1) conditional warnings, and not actual prophecies of judgment; 2) anthropopathisms, that is, attribution of human passions and emotions to God; or 3) accommodation, that is, God stoops low to speak to us in a way that we can understand.
The Spirituality Of God
"God is spirit" means that He is immaterial, invisible and immortal. He is not limited by space. He is not a man who has body parts, but He chose to enter into His creation as a man (Phil. 2:5-11). When we are told that we are created in the image of God, this does not mean that we look physically like God, but that we represent God. We, in some measure mirror God in what He does, and not that we look like Him. See more on the image of God here.
The Spirituality Of God is asserted in the following words, “a most pure spirit, invisible, without body, parts, or passions, who only hath immortality, dwelling in the light which no man can approach unto”. Although the simple Spirituality Of God is a communicable attribute, yet the full description of the Confession of God’s spirituality is peculiar only to God. It is true that both men and angels have or are spirits, but it is not true that men are without bodies, parts or passions. God is said to be a most pure spirit, which basically means that He is invisible. Scriptures agree with this. In John 4:24, the Lord Jesus told the Samaritan woman that “God is spirit” who should be worshiped “in spirit and truth.” To be spirit at most basic level is to be immaterial. God is not made up of stuff. He has no physical form (e.g. Deut. 4:12). The Lord Jesus teaches us elsewhere that “a spirit does not have flesh and bones” (Luke 24:39), i.e., a physical form. He is the “invisible God” who became visible in Jesus (Col. 1:15). He is “the King of the ages, immortal, invisible, the only God” (1Tim. 1:17). Even though the Bible often portrays God as having physical aspects, e.g. hands, eyes, feet, mouth, face, etc., we understand these things as merely baby-talk—God communicating to us in ways which we could understand, and not describing the reality of what He truly is. In the last verse, Paul says that God is immortal. In 1 Timothy 6:16, Paul says that God “alone has immortality, who dwells in unapproachable light, whom no one has ever seen or can see.” Immortality is the quality of being unable to die. God has this by virtue of His nature, on the other hand, humans have immortality by virtue of God granting them that. See chapter 31 for a little bit more on this. God alone, by virtue of being God, has no possibility of either not existing or ceasing to exist. God, by virtue of His being and nature, must exist and He cannot not exist.
Divine Impassibility is defined by Samuel Renihan as "God does not experience emotional changes either from within or affected by His creation." Webster defines it as “Incapable of pain, passion or suffering; that cannot be affected with pain or uneasiness. Whatever is destitute of sensation is impassible.” This is a subject which I still have to read on, but the idea is basically tha...