Formality and decorum (in terms of dress and behavior) are part of godly standards and sanctity. We must always look for the spirit and intent of what God commands.
The third commandment, contemplating God's name, may be the most misunderstood of all. This commandment covers the quality of our worship.
God is training us as a holy priesthood, called to offer unblemished sacrifices, honoring His name, putting down pride, presumptuousness, and arrogance.
The same attitudes in Malachi are prevalent today. The offenses mentioned are 1) arrogance, 2) mixed marriages, and 3) neglect of tithes.
A vile person is one who, in his contempt for God, is wicked, perverse, consumed by sin. Perhaps surprisingly, God says such people should be despised!
Holy things are set apart from the rest, consecrated, sanctified, and transcendentally separate. God wants to transform us into that very image.