13 Then Ananias answered, Lord, I have heard by many of this man, how much evil he hath done to thy saints at Jerusalem:
14 And here he hath authority from the chief priests to bind all that call on thy name.
15 But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel:
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How is God's work done? Over the two-thousand-year history of the Church, more has been said and written about this than actual works of God have been done. And with all this, no one has managed to understand it exactly to this day, much less has anyone managed to create a single general theory that would describe the algorithm of divine-human interaction in history.
Why is that? One could simply answer: because the ways of the Lord are inscrutable. And that would certainly be true: God's plans are known to no one except God Himself. But the question is how God interacts with people, and here the situation is somewhat different: insofar as God includes a person in His plan, He reveals this design to him, at least in part.
The point is perhaps something else: the very quality of the relationship between God and man. If everything had been scheduled in advance with God, the situation for His servants would, perhaps, have been simpler in some respects: then it really would be possible to try to develop some classification of possible interactions, not immediately, and over a long time, but the task would be solvable in principle. But the point is that with God, it appears, only the goals are marked out in advance, while the plan for achieving them changes continually according to the developing spiritual situation, or, more simply, according to who has once again said to God another "yes" or another "no."
In any case, classifying this mosaic of possibilities and the options for their realization is, of course, completely unrealistic. What remains is only to listen and hear God, who, having set the task, will certainly indicate the one to whom it can be entrusted. This does not mean, however, that over time a new worker will not replace the former one. And the options may be completely unexpected, at times in no way corresponding to any human ideas.
Who, indeed, could have seriously considered Paul as a preacher of Christ at the time when he appeared in Damascus? Humanly speaking, the most reasonable choice would have been to keep away from him. But Ananias makes a different choice, acting as God commands him to act. And Saul the persecutor becomes Paul, the great witness of Christ and the Kingdom.