When God doesn't answer prayer

http://expositorythoughts.wordpress.com/2009/06/11/when-god-doesn%E2%80%99t-answer-prayer/
by Matt Waymeyer (Expository Thoughts, 11 Jun 2009)

Waymeyer lists down nine hindrances to fruitful intercessory prayer.

1. Cherishing unrepentant sin in your heart (Ps 66:18)
2. Asking with selfish motives (James 4:3)
3. Failing to ask in faith (James 1:5-7)
4. Failing to pray according to God’s will (1 John 5:14-15)
5. Failing to care for your wife (1 Peter 3:7)
6. Failing to ask in the name of Jesus (John 14:13-14)
7. Failing to abide in Christ (John 15:7)
8. Failing to let Christ’s words abide in you (John 15:7)
9. Failing to be persistent (Luke 11:5-10; 18:1-8)