to tell things apart: to distinguish, discern, evaluate, or decide between them.
At its root the word means "to separate one thing from another", and from there to tell things apart in the mind. Depending on the setting, English needs different words for it:
- to make a distinction
- to size something up
- to weigh it
- to settle a matter between people
This is the everyday, uncontested meaning, and it runs from ordinary life into the life of the church. Peter reports that God made no distinction between Jewish and non-Jewish believers. Paul asks the proud Corinthians who it is that makes them any different from anyone else, tells them to weigh what a prophet says, and warns them to examine themselves before the Lord's Supper.
The same word also covers formal judging: arbitrating a case, deciding between two parties. What holds all of this together is the single act of drawing a line between things and then acting on the difference.