So Jesus said to them, “Because of your unbelief; for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you. However, this kind does not go out except by prayer and fasting.”
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Unbelief will not only delay your blessing, it will also cancel or hinder your blessing. Also, you may need to do more than pray, the Lord might ask you to fast. I’ve come to realize the Lord loves obedience during a fast but He is merciful if we break the fast for whatever reason. repent and get back to it and remember to keep praying through you situation or circumstance.