Colossians 3:1:

If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God.

See also:

Who You Are and What You Have
Objection: The Lord Puts Us on Our Backs That He May Teach Us to Look Up
Objection: We Should Live for Eternity, Not for Temporal Blessings
Objection: Faith Preachers Are Trinity-Denying Heretics Because They Teach That Jesus Died Spiritually