Contradiction with Proverbs 13:15
While Proverbs 4:12 talks about the path being unobstructed when wisdom is followed, Proverbs 13:15 contrasts by stating that the way of transgressors is hard, implying difficulty and obstruction.
Proverbs 13:15: Good understanding giveth favour: but the way of transgressors [is] hard.
Contradiction with Proverbs 14:12
Proverbs 4:12 suggests a straightforward path with wisdom, whereas Proverbs 14:12 warns that a way that seems right may end in death, indicating unpredictability.
Proverbs 14:12: There is a way which seemeth right unto a man, but the end thereof [are] the ways of death.
Contradiction with Ecclesiastes 1:18
Proverbs 4:12 indicates smooth progress with wisdom, but Ecclesiastes 1:18 states that in much wisdom is much grief, suggesting complications rather than ease.
Ecclesiastes 1:18: For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow.
Contradiction with Matthew 7:14
Proverbs 4:12 speaks of the broad and clear path of wisdom, yet Matthew 7:14 describes the way to life as narrow and difficult, implying challenges.
Matthew 7:14: Because strait [is] the gate, and narrow [is] the way, which leadeth unto life, and few there be that find it. [Because: or, How]
Contradiction with Proverbs 3:6
Proverbs 4:12 suggests your path will not be hindered, while Proverbs 3:6 focuses on the dependence on God to direct paths, not self-reliant.
Proverbs 3:6: In all thy ways acknowledge him, and he shall direct thy paths.