Identity of a Christian. 

Who you are: salt, light, city, lamp

What you do: special sauce for finger-lickin', you brighten (You Are My Sunshine), bustle, reveal.

Why you do it (apostolic, holy): help others see and worship God
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Christian: teach, instruct, build up, foster, mature. Appetite, hunger for:

True teaching:

What does it mean to belong to God, to be a part of his Kingdom, to call God your Father?

"Man does not live on bread alone but on every word that comes forth from the mouth of God." Mt 4:4

"He began to teach them." MT 5:2

"They shall be taught by God." Jn 6:45, cf. Is 54:14

"A light to reveal [God] to the nations." Lk 2:32

Simple images: salt (flavor), light (brighten), city (order, kingdom), lamp (illuminate).

Purpose (mindset): Others (relation, apostolate); God (worship, holiness)