Sincerity (Psa. 145:18; Matt. 6:5). Simplicity (Matt. 6:7, cf.
26:44). Earnestness (James 5:17; Acts 12:5; Luke 22:44). Persistence
(Luke 18:1-8; Col. 4:2; Rom. 12:12, R. V.). Faith (Matt. 21:22;
James 1:6). Unison with others (Matt. 18:19, 20). Definiteness
(Psa. 27:4; Matt. 18:19). Effort (Exod. 14:15). In the name of
Jesus (John 16:23; 14:13, 14). With fasting (Acts 13:2, 3; 14:23).