Contradiction with Proverbs 28:9
While Psalms 71:2 asks for deliverance and righteousness, Proverbs 28:9 suggests that if one turns away from hearing the law, their prayers become detestable, implying a condition contrary to unconditional righteousness.
Proverbs 28:9: He that turneth away his ear from hearing the law, even his prayer [shall be] abomination.
Contradiction with Isaiah 59:2
Psalms 71:2 talks of deliverance in righteousness, while Isaiah 59:2 states that iniquities separate us from God, contradicting the assurance of God's proximity and deliverance regardless of one's state.
Isaiah 59:2: But your iniquities have separated between you and your God, and your sins have hid [his] face from you, that he will not hear. [have hid: or, have made him hide]
Contradiction with James 4:3
Psalms 71:2 is a plea for deliverance, yet James 4:3 states that one asks but does not receive because they ask with wrong motives, creating a potential contradiction in receiving help merely by request.
James 4:3: Ye ask, and receive not, because ye ask amiss, that ye may consume [it] upon your lusts. [lusts: or, pleasures]
Contradiction with Matthew 6:7
While Psalms 71:2 seeks God's attention and action, Matthew 6:7 warns against vain repetitions in prayer, suggesting that not all prayers will be heard just because they are spoken.
Matthew 6:7: But when ye pray, use not vain repetitions, as the heathen [do]: for they think that they shall be heard for their much speaking.