New Defender's Study Bible Notes
4:18 understanding darkened. Pagan unbelievers may be intellectual, “in the vanity of their mind” (Ephesians 4:17), but their “understanding [is] darkened.” Despite their worldly learning, they are ignorant and blind to real truth. Therefore we are to “walk not as other Gentiles walk,” trying to please them.
4:22 conversation. See note on II Corinthians 1:12.
4:24 created. The “new man” is an actual new creation (II Corinthians 5:17), a miracle of regeneration performed by the Holy Spirit on a heart and mind receiving Christ by faith as personal Savior and Lord.