Contradiction with Ecclesiastes 1:14
This verse reflects on the vanity and fleeting nature of earthly achievements, which contrasts with the praise for enduring strength and salvation in Psalms 21:1.
Ecclesiastes 1:14: I have seen all the works that are done under the sun; and, behold, all [is] vanity and vexation of spirit.
Contradiction with Job 21:7
This verse questions why the wicked prosper, in contrast to the assurance of divine strength and salvation for the righteous in Psalms 21:1.
Job 21:7: Wherefore do the wicked live, become old, yea, are mighty in power?
Contradiction with Habakkuk 1:2-3
These verses express frustration at unanswered prayers and the prevalence of injustice, contradicting the confident boasting of divine intervention in Psalms 21:1.
Habakkuk 1:2-3: O LORD, how long shall I cry, and thou wilt not hear! [even] cry out unto thee [of] violence, and thou wilt not save!
Contradiction with Lamentations 3:8
This verse speaks about God not hearing prayer, which contradicts the notion of God providing strength and salvation as stated in Psalms 21:1.
Lamentations 3:8: Also when I cry and shout, he shutteth out my prayer.