The most remarkable characteristic of a Christian is the unveiled face. Open and honest, hiding nothing, we stand before God so that our lives may become a mirror of his. By being filled with the Spirit, we are transformed. By standing unveiled before him, we become his mirror. It is always easy to sense when someone has been beholding the glory of the Lord. We can feel the Lord’s own character, shining out from within.

The golden rule for the Christian life is this unfailing concentration on God. If God requires it, we must be willing to set aside our concerns for everything else—work, food, clothing, shelter, everything. The busyness of modern life tends to draw our attention away from God, darkening the mirror within. Usually, the thing that dirties the mirror is a “good” thing, a worthy concern. It is the good that is the enemy of the best.

Let other things come and go as they may. Let other people criticize as they will. But never let anything disturb the life that is hidden with Christ in God. Never be hurried out of the relationship of abiding in him. This is the one thing that tends to get pushed aside, and it is the one thing that shouldn’t. It is the toughest discipline we undergo as Christians: the discipline of keeping our focus on the glory of the Lord.

Wisdom from Oswald

Sincerity means that the appearance and the reality are exactly the same.
Studies in the Sermon on the Mount