I will shew (upodeixw). Beforehand as a warning as in Luke 3:7 and from time to time. He must suffer (dei auton paqein). Constative aorist active infinitive (paqein, from pascw) covering the whole career of Saul. Suffering is one element in the call that Saul receives. He will learn "how many things" (osa) are included in this list by degrees and by experience. A glance at 2 Corinthians 10-12 will show one the fulfilment of this prophecy. But it was the "gift" of Christ to Paul to go on suffering (pascein, present infinitive, Philippians 1:29 ).