Mark 11:22-26

"And Jesus answering saith unto them, Have faith in God. For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith. Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them. And when ye stand praying, forgive, if ye have aught against any; that your Father also which is in heaven may forgive you your trespasses. But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses."
I have found this scripture of great benefit to myself and others in this connection. Here we have:
Faith -the "faith in God," that is, faith that takes its character and strength from God as its object-faith that brings God into the difficulty. There is a mountain to be removed. God only can lift a mountain up and throw it into the sea. But He is greater than the mountain; and if you can bring Him into the matter, the mountain must go.
Prayer is our proper attitude-what expresses our dependence on God—but the prayer of faith only is effectual.
3) There is a condition; that is, this prayer of faith is conditional on a certain
state in us, and that is the spirit of forgiveness. "When ye stand praying, forgive, if ye have aught against any." It is not here going to one who has wronged you, and telling him you forgive him. In such a case the word is, "If he repent, forgive him." But here it is the state of our hearts toward our brethren when we are in the presence of God. Suppose I am praying to God who has forgiven me ten thousand talents in absolute grace, and am holding something against one who may have wronged me, God will not hear me. I am not in communion, my state is wrong, I am not in the current of God's thoughts, and will not be able to exercise faith.
A person says: "I cannot feel right toward Mr. A." That is, he has hard feelings toward Mr. A. But can I think of God in this way? Can I speak of Him as having "hard feelings" to ward anyone? Never. When we were enemies, He gave His Son. Now my heart is to be in the same state as His; that is, my feelings and desires are to be formed by what flows down in communion through the Word from His heart into mine. And if this is my state when I pray, I will forgive, if I have anything against anyone; and my heart will be free in God's presence. And, however my brother may have erred, I will be able to seek his blessing and restoration.
In case of personal difficulties among saints, if this state is reached in God's presence, it is wonderful how soon difficulties melt away, because it is God Himself coming in to act in grace.