Contradiction with Proverbs 27:1
This verse advises not to boast about the future, whereas Psalms 71:15 speaks of declaring God's righteousness continuously.
Proverbs 27:1: Boast not thyself of to morrow; for thou knowest not what a day may bring forth. [to...: Heb. to morrow day]
Contradiction with Matthew 6:34
This verse suggests taking no thought for tomorrow, which contradicts the continuous declaration implied in Psalms 71:15.
Matthew 6:34: Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day [is] the evil thereof.
Contradiction with James 4:13-14
These verses warn against presuming about future plans, contrasting with the certainty of proclaiming God's works as in Psalms 71:15.
James 4:13-14: Go to now, ye that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain:
Contradiction with Job 37:5
This verse emphasizes the incomprehensibility of God's ways, which might contradict the understanding needed to continuously declare His works as suggested in Psalms 71:15.
Job 37:5: God thundereth marvellously with his voice; great things doeth he, which we cannot comprehend.