Contradiction with James 4:13-15
While Psalms 20:5 speaks of joy in the victories and plans of others, James 4 cautions against taking the future for granted and presumes upon the will of God instead.
James 4:13-15: 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 Proverbs 27:1
Psalms 20:5 celebrates forthcoming success, whereas Proverbs 27:1 advises against boasting about future plans, reminding that we do not know what the day may bring.
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
Psalms 20:5 expresses confidence in future triumphs, but Matthew 6:34 advises to not worry about the future and to focus on each day’s own troubles.
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 Luke 12:19-20
Psalms 20:5 anticipates celebration over victories, while the parable in Luke warns against overconfidence in future prosperity, as plans can abruptly change.
Luke 12:19-20: And I will say to my soul, Soul, thou hast much goods laid up for many years; take thine ease, eat, drink, [and] be merry.
Contradiction with Ecclesiastes 11:6
Psalms 20:5 assumes success in the endeavors of others, while Ecclesiastes 11:6 suggests that people cannot predict which efforts will prosper.
Ecclesiastes 11:6: In the morning sow thy seed, and in the evening withhold not thine hand: for thou knowest not whether shall prosper, either this or that, or whether they both [shall be] alike good. [shall prosper: Heb. shall be right]