If then you have been raised with Christ, seek the things that are above, where Christ is seated at the right hand of God. Set your minds on things that are above, not on things that are on earth. Colossians 3:1-2
You should realize that you are walking on the edge of a sharp sword, that you are standing on the edge of a precipice with a ravine on either side. Do not let your thoughts be upset by things here on earth, but keep your mind’s gaze on “Jerusalem which is above” (Galatians 4:26). Think of what is above, and not of what is on earth. Ensure that you let go of everything which belongs to this world.
Babai the Great (d. 628) Letter to Cyriacus 55 in the Ancient Christian Commentary on Scripture vol. IX, ed. by Peter Gorday (Downers Grove: IVP, 2000) 46.