the mind: a person's power to understand and think, bound up with the heart rather than standing apart from it as pure intellect
This word names the thinking side of a person, but not as a separate compartment labeled the intellect. In the Greek Old Testament it is one of the standard words for the inner life the Hebrew Bible calls the heart (לֵבָב), and that background shapes every New Testament use. When Jesus tells his hearers to love God with all their heart, soul, strength, and mind, the mind he names is not an extra faculty tacked onto the list; it is the whole person considered as one who understands.
That is why this mind has a spiritual condition rather than just a level of ability:
- it can be darkened, so that a person cannot see
- it can be turned against God in open hostility
- it can be given, so that a person knows the truth
- it is the inward place where God promises to write his law
Peter can even picture it as someone tucking up a long robe to move freely: an understanding braced and ready for action.
From there the word slides naturally to what the mind turns out. The proud are scattered in the thinking of their hearts, and people once lived out the cravings of the body and of their thoughts. The capacity and its products share one word, much as English "thinking" can mean both the activity and the conclusions someone has reached.