to think or suppose: to hold in one's own mind an opinion about what is the case, from a confident conclusion to a guarded guess, and often one the text goes on to correct
This is the verb for the judgment a person forms inside their own head. It stretches from a settled "I am certain that" to a careful "I would think," and the New Testament reaches for it again and again to name a conclusion that feels obvious yet proves false:
- the disciples are certain they are seeing a ghost
- Mary is certain she is speaking to the gardener
- the crowd is certain the kingdom is about to arrive
A favorite move of Paul is to aim the word at a person's estimate of himself. "If anyone thinks he is wise," "if anyone thinks he has knowledge," "the one who thinks he stands," "if anyone thinks he is religious": each time the word sets up a self-image the writer is about to challenge. So it often carries a quiet warning built in, that what a person is sure of, whether about the world or about himself, is not the same as what is true.
The two shades below differ only slightly. The first is plain supposing, taking something for granted, where most of the mistaken-belief examples sit. The second is a more deliberate weighing of a question, including the common "what do you think?" and a writer's own measured "I think" or "I think not."