Contradiction with 1 Corinthians 14:20
This verse advises believers not to be like children in understanding, advocating maturity and wisdom, contrasting with the emphasis on childlike humility in Matthew 18:2.
1 Corinthians 14:20: Brethren, be not children in understanding: howbeit in malice be ye children, but in understanding be men. [men: Gr. perfect, or, of a ripe age]
Contradiction with 1 Corinthians 13:11
This verse speaks about putting away childish things upon becoming an adult, which contrasts with the example of becoming like a child in Matthew 18:2.
1 Corinthians 13:11: When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things. [thought: or, reasoned] [put away: Gr. vanish away]
Contradiction with Hebrews 5:13-14
It contrasts spiritual immaturity and maturity, encouraging maturity and discernment rather than the childlike state depicted in Matthew 18:2.
Hebrews 5:13-14: For every one that useth milk [is] unskilful in the word of righteousness: for he is a babe. [is unskillful: Gr. hath no experience]