Doesn’t John contradict himself when he asserts that Christians are without sin?

1 John 3:

1 John 2:28 - 3:10

NKJV - ²⁸ And now, little children, abide in Him, that when He appears, we may have confidence and not be ashamed before Him at His coming. ²⁹ If you know that He is righteous, you know that everyone who practices righteousness is born of Him.

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