It was God's will that he (Paul) do so
Then it must have been God's will that Corinthians disobey what they were taught; it was all staged.
I don't really have a firm stand in any of the predetermination camps.
For me, ... it is a matter of attempting to ascertain how God did/does what He did/does.
I believe that such a knowledge is too wonderful for me; it is high, I cannot attain unto it.
So ... however it is that He did/does what He did/does, ... I was really speaking to the grace that God gives us ... to know that we are His children.
It is His desire that we know that we are His ... and that such knowledge is not at all presumptuous.
1 John 5:11 And this is the record, that God hath given to us eternal life, and this life is in his Son.
12 He that hath the Son hath life; and he that hath not the Son of God hath not life.
13 These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
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Romans 8:14 For as many as are led by the Spirit of God, they are the sons of God.
15 For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.
16 The Spirit itself beareth witness with our spirit, that we are the children of God:
That knowledge is a hope that we are His; being certain is presumptious.