“And this I say, lest any man should beguile you with enticing words.”
King James Version (KJV)
2:2 Unto all riches of the full assurance of understanding, unto the acknowledgment of the mystery of God - That is, unto the fullest and clearest understanding and knowledge of the gospel.
2:6 So walk in him - In the same faith, love, holiness.
Col 2:4 Lest any man should beguile you. Had they full knowledge, this would not be possible. See Col 2:2.