If you are to really understand the spiritual call of the laity you must go back to the Old Testament. God's plan was for the entire nation of Israel to be priests or ministers:
Kung iyong tunay na nauunawaan ang espirituwal na tawag ng layko dapat kang bumalik sa Lumang Tipan. Ang plano Ng Dios para sa buong bansa na Israel ay maging saserdote o mga pastor: