Contradiction with Proverbs 10:4
While Proverbs 15:19 suggests that the way of the slothful is hindered, Proverbs 10:4 implies that diligence, which contrasts slothfulness, leads to wealth, not the hindrances of slothfulness.
Proverbs 10:4: He becometh poor that dealeth [with] a slack hand: but the hand of the diligent maketh rich.
Contradiction with Ecclesiastes 9:10
Proverbs 15:19 portrays the slothful path as obstructed, but Ecclesiastes 9:10 encourages doing work with all one's might, contrasting slothfulness.
Ecclesiastes 9:10: Whatsoever thy hand findeth to do, do [it] with thy might; for [there is] no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.
Contradiction with Proverbs 12:24
This verse states that the diligent will rule, contrasting the hindrance and lack of progress suggested for the slothful in Proverbs 15:19.
Proverbs 12:24: The hand of the diligent shall bear rule: but the slothful shall be under tribute. [slothful: or, deceitful]
Contradiction with Proverbs 13:4
This verse shows that the diligent are fulfilled, which contradicts the image of a hindered, slothful path given in Proverbs 15:19.
Proverbs 13:4: The soul of the sluggard desireth, and [hath] nothing: but the soul of the diligent shall be made fat.