He had to be called and commissioned by the risen Lord directly (John 20:21, Acts 26:15-18), which included that he received the gospel from Jesus Himself (Gal. 1:11-12).
Kailangang harapan siyang tinawag at tinagubilinan ng nabuhay muling Panginoon (Juan 20:21; Mga Gawa 26:15-18), na kalakip nito ay ang pagtanggap niya ng ebanghelyo galing mismo kay Jesus (Mga Taga-Galacia 1:11-12).