It is to exist in a state of purity that is reflective of God's righteousness and holiness. This is an indication that this is not simply a ritualistic purity or a sense of goodness, but it is to be cleaned and purified of the sin that was previously there. Untainted, this doesn't mean that sin and taint don't try but that sin and selfishness are not successful. This also a state of being a state of living. It is who you are. to be pure in this way is not simply about refraining from doing certain things, but it is about a purity that flows from who you are, personally. We are not clean because of where we are, but we are clean because of who we are. And as believers we are clean because of what God has said about us! God presents us as pure as we participate in Christ, God declares us pure, as we do His will, and then God makes us pure as we are indwelled by the Holy Spirit and walk in obedience to the Spirit of God. Our purity then is three pronged. We are presented pure, we are declared pure, and we are made pure- all by God also through our participate in what God is doing, not in God's participation in what we desire. We are cleansed by our participation in God's will, not our own will. We often want God to clean us up because of what we do, but we never link our cleanliness to our obedience to the will of God. When you are in line with the Lord, your purity is reflected in what you do. It is not simply that everything is permissible, but everything is understood. And when everything is understood, from God's perspective- it is easy to operate from a locus of purity. This purity however is rooted in the relationship with God- not in things.