Charles Finney emphasizes the conditions necessary for effective prayer, asserting that true prayer is always heard and answered, but often not in the way we expect. He explains that many fail to receive answers because they do not meet the revealed conditions of prayer, such as sincerity and a heart aligned with God's will. Finney highlights the importance of approaching God with a spirit of reverence, forgiveness, and dependence, as exemplified in the Lord's Prayer. He warns against the dangers of vain repetitions and emphasizes that prayer must come from a genuine heart, reflecting a desire for God's kingdom and will to be done. Ultimately, he calls believers to ensure their lives align with their prayers, as true prayer requires a holy life and sincere intentions.

William MacDonald emphasizes the profound nature of prayer, asserting that true prayer arises from deep necessity and sincerity. He highlights the importance of approaching God with a genuine heart, avoiding hypocrisy, and being willing to act on our prayers. MacDonald encourages believers to pray simply and boldly, aligning their requests with God's will, and to maintain a close relationship with Him through confession and obedience. He also stresses the value of persistent and specific prayer, suggesting that prayer should be a continuous attitude rather than limited to set times.

Richard Sipley emphasizes the significance of honesty and sincerity in both ministry and prayer, urging believers to be genuine in their service to God. He reflects on the teachings from 2 Timothy 2, encouraging strength in grace and the importance of sharing the truth learned from faithful witnesses. Sipley calls for a heartfelt approach to ministry, highlighting that sincerity in prayer and service is essential for effective ministry and spiritual growth.

R.A. Torrey emphasizes the vital connection between obedience to God's commandments and the effectiveness of prayer, citing 1 John 3:22 to illustrate that those who keep God's commands receive what they ask for. He argues that many unanswered prayers stem from disobedience and a lack of sincere desire for God's will, urging believers to seek what pleases God beyond mere commands. Torrey also highlights the importance of praying 'in truth,' meaning that prayers should reflect genuine desires rather than insincere requests. He challenges the audience to examine their true intentions behind their prayers, as many may not truly desire what they ask for. Ultimately, Torrey calls for a deeper commitment to understanding and fulfilling God's will to unlock the power of prayer.

Thomas Brooks emphasizes that true prayer is rooted in the sincerity of the heart, as expressed in Proverbs 23:26, 'My son, give Me your heart.' He argues that God desires our whole heart in prayer, rather than mere eloquence or formality. Brooks points out that many fail in their prayer life because they do not engage their hearts fully, and that heartfelt prayer leads to divine acknowledgment and reward. He warns that prayers lacking sincerity are empty and ineffective, likening them to mere noise without substance. Ultimately, Brooks teaches that God listens to the heart's cry, and only prayers that stem from a sincere heart are accepted by Him.