Jeremiah 18:7-10: "If at any time I announce that a nation or kingdom is to be uprooted, torn down and destroyed, and if that nation I warned repents of its evil, then I will relent and not inflict on it the disaster I had planned. And if at another time I announce that a nation or kingdom is to be built up and planted, and if it does evil in my sight and does not obey me, then I will reconsider the good I had intended to do for it. "

God is saying, "If I decide that a nation, or an individual, needs to be chastened, if that individual or nation repents, I reserve to myself the right to nullify my intended action if I so choose." He does not always choose, but He can.

Changing the mind of God through fasting is not a contradiction of the Scripture.

3. When we need to Intensify the Power of our Prayers

I mentioned this purpose above; but, I wanted to make it stand out because of its significance. God promised in Isaiah 58:3-5, 9: "I won't hear with your fasting, but if you'll do a true fast... then I will hear."

How often we have made earnest prayer to God for some specific need, yet, there was no answer from heaven.

Why? It could well be that God is saying to us Jeremiah 29:13: "When you seek me with all your heart, I will be found by you..."

When we are in turmoil, it is time to fast. When we are out of work, struggling with poor personal relationships, suffering with sickness, worried about wayward children, etc. it is time to fast.

4. When we need Freedom From Various Bondages

When you think about it, we have the opportunity to be in bondage to more things than any other culture in history. We can be enslaved and/or addicted to so many things: consumerism, jobs, cars, sports, TV, lust, porn, alcohol, cigarettes, drugs, sex, video games, gambling, the occult, black magic, bitterness, resentment, jealousy, etc. You name it and we can find someone addicted to it.

Prayer with earnest fasting is designed to help us free ourselves from these bonds. God promised in Isaiah 58:6: “Is this not the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free and break every yoke?”

5. When we need help forgivING ourselves for past sins

I never cease to be amazed by the Christians who have trouble accepting God's forgiveness for some of the sins in their pasts. Surprise! That includes most all of us.

John the beloved Disciple spoke for God in 1 John 1:9: "If we confess our sins He is faithful and just to forgive our sins and to cleanse us from all unrighteousness." This promise, when properly accepted and appropriated, can help us forgive ourselves, put our past mistakes in perspective and move on to the future.

Both King Ahab (1 Kings 21:27) and David used this tool to get over the mistakes and sins of the past (2 Samuel 12:162 Samuel 12:21-23).

If you are guilty of sin, and have confessed and repented, and are still feeling accused, then fast.

6. When are in danger and need Protection.

The Jews fasted and prayed after hearing of King Xerxes’ plan to kill them all. Mordecai instructed Esther: “You must go and confront the King about this matter even if it is against the law for you to approach him uninvited.”

Then Esther sent this reply to Mordecai as recorded in Esther 4:16  “Go, gather together the Jews who are in Susa, and fast for me. Do not eat or drink for three days, night or day. I and my maids will fast as you do. When this is done, I will go to the king, even though it is against the law. And if I perish, I perish.”