There are many promises and instances of answered prayer in the Bible. Unfortunately, many of us really don’t seem to believe them, and therefore don’t experience the answers to our prayers. Halfhearted praying may sometimes secure partial answers, but God exhorts us to pray wholeheartedly. "The effectual fervent prayer of a righteous man availeth much" (James 5:16).
The principle is timeless and is stressed often in the Word. "Call unto me, and I will answer thee, and show thee great and mighty things, which thou knowest not" (Jeremiah 33:3). God’s resources are unlimited, but our motives must be pure, and our prayers must be from the heart. "Let him ask in faith, nothing wavering" (James 1:6). "Ye ask, and receive not, because ye ask amiss, that ye may consume it upon your lusts" (James 4:3).
In addition to right motives and genuine faith, there must be deep sincerity as we pray from the heart. "Men ought always to pray, and not to faint" said Jesus (Luke 18:1), who Himself found it necessary to pray long and earnestly. "Rising up a great while before day, he . . . departed into a solitary place, and there prayed" (Mark 1:35).
The early church followed His teaching and example, and saw His blessing. "These all continued with one accord in prayer and supplication" (Acts 1:14). "And they continued stedfastly . . . in prayers" (Acts 2:42). "We will give ourselves continually to prayer" (Acts 6:4). Consequently, "the word of God increased; and the number of the disciples multiplied in Jerusalem greatly" (Acts 6:7). God is honored when we search for Him and pray to Him with all our hearts. HMM http://www.icr.org/article/6107/