Contradiction with Ecclesiastes 9:11
This verse suggests that success or reward is not necessarily a result of effort or endurance, but rather due to time and chance.
Ecclesiastes 9:11: I returned, and saw under the sun, that the race [is] not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all.
Contradiction with Job 21:7-9
These verses reflect on the prosperity of the wicked, seemingly contradicting the idea that doing good will surely lead to a positive outcome.
Job 21:7-9: Wherefore do the wicked live, become old, yea, are mighty in power?
Contradiction with Psalm 73:3-5
These verses express the observation that the wicked are often prosperous and free from troubles, whereas Galatians 6:9 emphasizes reaping good from doing good.
Psalm 73:3-5: For I was envious at the foolish, [when] I saw the prosperity of the wicked.
Contradiction with Jeremiah 12:1-2
Here, the prophet questions why the wicked prosper, which could contradict the notion that good works always result in good outcomes.
Jeremiah 12:1-2: Righteous [art] thou, O LORD, when I plead with thee: yet let me talk with thee of [thy] judgments: Wherefore doth the way of the wicked prosper? [wherefore] are all they happy that deal very treacherously? [talk...: or, reason the case with thee]
Contradiction with Malachi 3:14-15
These verses describe people questioning the benefit of serving God when they see evildoers prosper, which contrasts with the encouragement in Galatians 6:9 to not be weary in doing good.
Malachi 3:14-15: Ye have said, It [is] vain to serve God: and what profit [is it] that we have kept his ordinance, and that we have walked mournfully before the LORD of hosts? [ordinance: Heb. observation] [mournfully: Heb. in black]