Contradiction with Matthew 21:22
Contradicts the belief that actions are validated by signs, as it suggests faith is what ensures a request is granted.
Matthew 21:22: And all things, whatsoever ye shall ask in prayer, believing, ye shall receive.
Contradiction with Matthew 6:7
Contradicts by suggesting that repetitive prayers, like confirmations through signs, are unnecessary for God to hear.
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.
Contradiction with James 4:3
Implies that asking or seeking signs for the wrong reasons, even for guidance like in Genesis 24:42, can be ineffective.
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 Romans 8:26
Suggests that the Spirit helps in prayer instead of relying solely on signs for confirmation of actions.
Romans 8:26: Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered.