Contradiction with Proverbs 3:5-6
Trust in the LORD with all thine heart; and lean not unto thine own understanding contradicts the idea of the limits of human understanding present in Ecclesiastes 8:16.
Proverbs 3:5-6: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Isaiah 55:8-9
For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD highlights the idea of God's higher ways, contrasting the human pursuit to understand all as described in Ecclesiastes 8:16.
Isaiah 55:8-9: For my thoughts [are] not your thoughts, neither [are] your ways my ways, saith the LORD.