1—Entire dependence upon the merits and mediation of the Lord Jesus Christ, as the only ground of any claim for blessing. (See John 14:13,14; 15:16, etc.)
2—Separation from all known sin. If we regard iniquity in our hearts, the Lord will not hear us, for it would be sanctioning sin. (Ps. 66:18.)
3—Faith in God's word of promise as confirmed by His oath. Not to believe Him is to make Him both a liar and a perjurer. (Heb. 11:6; 6:13-20.)
4—Asking in accordance with His will. Our motives must be godly: we must not seek any gift of God to consume it upon our lusts (I John 5:14; James 4:3.)
5—Importunity in supplication. There must be waiting on God and waiting for God, as the husbandman has long patience to wait for the harvest. (James 5:7; Luke 18:1-8.)
From Answers to Prayer from George Müller's Narratives compiled by A. E. C. Brooks. Chicago: Moody Press, ca. 1897.
>> More George Müller