John Calvin on 1 Corinthians 15:11

11. Whether I or they Having compared himself with the other Apostles, he now associates himself with them, and them with him, in agreement as to their preaching. “I do not now speak of myself, but we have all taught so with one mouth, and still continue to teach so.” For the verb κηρύσσομεν (we preach) is in the present tense — intimating a continued act, or perseverance in teaching. “Perseuerance a enseigner ceste mesme chose;” — “Perseverance in teaching this same thing.” “If, then, it is otherwise, our apostleship is void: nay more — so ye believed: your religion, therefore, goes for nothing.”