Colossians 3:1-4; NKJV
"If then you were raised with Christ, seek those things which are above, where Christ is, sitting at the right hand of God. 2 Set your mind on things above, not on things on the earth. 3 For you died, and your life is hidden with Christ in God. 4 When Christ who is our life appears, then you also will appear with Him in glory."
“Set your mind on” - to exercise the mind, i.e. entertain or have a sentiment or opinion; by implication, to be (mentally) disposed (more or less earnestly in a certain direction); intensively, to interest oneself in (with concern or obedience) (Strong's); oo direct one's mind to a thing, to seek or strive for (Thayer's)
Why?
1. You were raised with Christ.
2. Christ is above.
3. You died.
4. Your life is hidden with Christ in God.
5. Christ is your life.