Jesus had clearly explained WHY Thomas said what he said at John 20:28. Unfortunately, that plain fact is completely ignored by Trinitarians for the sake of their doctrinal traditions.
In the context of seeing and believing, Thomas confessed exactly what Jesus had taught him about seeing and believing. The Spirit reminds believers of everything Jesus taught and guides them into all the truth. The wisdom of men is foolishness to God and He catches the wise in their craftiness.
“If I speak truth, WHY DO YOU NOT BELIEVE ME? He who is of God hears the words of God; for this reason you do not hear them, because you are not of God.”
– Jesus Christ
Trinitarian academics have completely failed us. Do not put your trust in earthly men; rather put your trust in Jesus in whom are all the treasures of knowledge and wisdom.