Purity is not innocence; it is much more. Purity is the outcome of sustained spiritual closeness with God. We have to grow in purity. Our private life with God may be healthy, and our inner purity may be unsullied, and still, every now and again, the bloom on the outside may become tarnished.

God doesn’t shield us from this possibility. When we go astray in some outward expression or action, we realize just how necessary outward purity is to maintaining our vision of God. Spiritual understanding becomes blurred the instant we go astray in our external lives. When we notice that the outward bloom of our life with God has been damaged, even to a tiny degree, we must stop everything and correct it. The inner sanctuary and the outer rooms must be brought into perfect agreement.

God makes us pure by his sovereign grace, but we also have something we must take care of: our bodily lives. Our bodily lives bring us into contact with other people and other points of view, and if we are not careful these external influences can tarnish our purity. If we are going to keep in personal contact with Jesus, there are some things we must refuse to do or touch or think, even things which seem worthy and legitimate to others. A practical way of maintaining personal purity around other people is to say to yourself, “That man, that woman: perfect in Christ Jesus! That friend, that relative: perfect in Christ Jesus!”

Remember that spiritual vision depends on character: “Blessed are the pure in heart, for they will see God.”

Wisdom from Oswald

Defenders of the faith are inclined to be bitter until they learn to walk in the light of the Lord. When you have learned to walk in the light of the Lord, bitterness and contention are impossible.
Biblical Psychology