Mark 1:34

And he healed many that were sick of divers diseases
Not that there were some, who had some sorts of diseases, whom he did not heal; but he healed all that came, or were brought to him, which were many, of every sort of disease, which were divers, with which they were afflicted:

and cast many devils;
even as many as were brought to him, or were possessed with any:

and he suffered not the devils to speak;
either for him, or against him; which shows his great power over them:

because they knew him,
or "that they knew him": he would not suffer them to say a word about him, because he knew that they knew that he was the Christ, the Son of God, or he would not permit them to say who he was; because he had others to bear witness of him, and better testimonies than theirs, and lest his enemies should reproach him with an agreement and familiarity with them.