So much of what passes for "purity" in the Christian world is anything but! Tozer pegs it here, or in the words of a chorus that used to be popular:
Turn your eyes upon JesusThat is purity. That is holiness. Christ living his life through you. Or, as 2 Peter 1 puts it, "3 By his divine power the Lord has given us everything we need for life and godliness through the knowledge of the one who called us by his own honor and glory. 4 Through his honor and glory he has given us his precious and wonderful promises, that you may share the divine nature and escape from the world’s immorality that sinful craving produces." (CEB)
Look full in his wonderful face
And the things of earth will grow strangely dim
In the light of his glory and grace.
Or, as some translations put it, "partakers in the divine nature." That's a pretty big promise!