Consider (noei). Present active imperative of noeō, old verb, to put your mind (nous) on. See Eph 3:4 and like command in 1Co 10:15.
Understanding (sunesin). “Comprehension” (from suniēmi, to send together, to grasp). See note on Col 1:9; note on Col 2:2. This is a blessed promise that calls for application.