Contradiction with Proverbs 4:7
Ecclesiastes 10:15 speaks of labor as wearisome due to lack of understanding, whereas Proverbs 4:7 emphasizes that wisdom and understanding are of utmost importance and should be pursued.
Proverbs 4:7: Wisdom [is] the principal thing; [therefore] get wisdom: and with all thy getting get understanding.
Contradiction with Proverbs 14:23
This verse states that in all labor there is profit, suggesting the value and benefit of work, contradicting the wearisome and seemingly unprofitable nature of labor in Ecclesiastes 10:15.
Proverbs 14:23: In all labour there is profit: but the talk of the lips [tendeth] only to penury.
Contradiction with Ecclesiastes 2:24
Here, it is stated that there is nothing better than for a man to enjoy his labor, which contradicts the notion of labor being wearisome and burdensome in Ecclesiastes 10:15.
Ecclesiastes 2:24: [There is] nothing better for a man, [than] that he should eat and drink, and [that] he should make his soul enjoy good in his labour. This also I saw, that it [was] from the hand of God. [should make...: or, delight his senses]
Contradiction with Matthew 11:28
Jesus promises rest to those who labor and are heavy laden, providing a relief from weariness, whereas Ecclesiastes 10:15 highlights the weariness without offering a solution.
Matthew 11:28: Come unto me, all [ye] that labour and are heavy laden, and I will give you rest.