What Hinders Our Prayers?

Unconfessed Sin
If I regard iniquity in my heart, the Lord will not hear me. Psalm 66:18

Rebellion Against God
Pro 28:9: "He that turneth his ears from hearing the law even his prayer shall be an abomination".

Lack of Faith
"If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not, and it shall be given him. But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed. For let not that man think that he shall receive anything of the Lord. A double minded man is unstable in all his ways." James 1:5-8

Unforgiveness
"For if ye forgive men their trespasses, your heavenly Father will also forgive you; but if ye forgive not men their trespasses, neither will your Father forgive your trespasses" Matthew 6:15

Dishonoring Your Wife
"You husbands likewise, live with our wives in an understanding way, as with a weaker vessel, since she is a woman; and grant her honor as a fellow heir of the grace of life, so that your prayers may not be hindered."(1 Peter 3:7)

Impure Motives
James 4:3 “You ask and do not receive, because you ask amiss, that you may spend it on your pleasures."

See also D.L. Moody's book, Prevailing Prayer, What Hinders It? There is a Google(C) scan of the book
at  Sermon Depository here.