Do not be afraid, Daniel. Since the first day that you set your mind to gain understanding and to humble yourself before your God, your words were heard, and I have come in response to them. But the prince of the Persian kingdom resisted me twenty-one days. Daniel 10:12-13
This passage is a wonderful teaching on prayer and shows us the direct hindrance Satan can be in our lives. Daniel had fasted and prayed for twenty-one difficult days. As far as we can tell from the biblical account, the difficulty came not because his prayer was not right but because of a special attack from Satan.
The Lord had sent His angelic messenger to tell Daniel that his prayer was answered the moment he began to pray, but the good angel was hindered by an evil angel who met him along the way and wrestled with him. This conflict occurred in the heavens, yet Daniel experienced the same kind of conflict here on earth as he agonized in prayer. "Our struggle is not against flesh and blood, but against the rulers, against the authorities,...and against the spiritual forces f evil in the heavenly realms" Ephesians 6:12. Satan's attack and the ensuing struggle delayed the answer three full weeks. Daniel was nearly defeated, and Satan would have been glad to kill him, but God would not allow anything to come upon Daniel beyond what he could bear. (See 1 Corinthians 10:13.)
Many prayers of believers are hindered by Satan. Yet you do not need to fear when your unanswered prayers are piling up, for soon they will break through like a flood. When that happens, not only will your answers flow through but they will also be accompanied by new blessings. from a sermon
Hell works the hardest of God's saints. The most worthy souls will be tested with the most pressure and the highest heat, but heaven will not desert them. William L. Watkinson