Albert Barnes' Notes on the Whole Bible - 1 John 3:3
And every man that hath this hope in him - This hope of seeing the Saviour, and of being made like him; that is, every true Christian. On the nature and influence of hope, see the notes at Romans 8:24-25.Purifieth himself - Makes himself holy. That is, under the influence of this hope of being like the Saviour, he puts forth those efforts in struggling against sin, and in overcoming his evil propensities, which are necessary to make him pure. The apostle would not deny that for the success of... read more
The Pulpit Commentary - 1 John 3:3
The hope: its purifying power. Connecting link: The apostle has just pointed out the blessedness which gathers round the new relationship of children of God, both as to its present privilege and as to its future glory. And if any one should suggest that it is very questionable doctrine, to assert merely that the sight of Christ by-and-by will make them all that they ought to be, the anticipative reply is ready. That sight will but complete the resemblance which is even now being aimed at... read more