Acts 9:18 Immediately there fell from his eyes something like scales, and he received his sight at once; and he arose and was baptized.
Saul still did not see the whole purpose of the Gospel after his experience on the road to Damascus. It was only after Ananias prayed for him that his eyes were truly opened.
God is able to tell us everything we ought to know, but He wants us to hear it from people around us too.
God wants our trust, but He also wants our fellowship; that fellowship begins with being around people who know Him too.