Now the Prophet shows more clearly why he continued in silence for seven days, because, indeed, he had been appointed a teacher, but the time had not fully arrived in which he was to utter the commands of God. He waited, therefore until he should receive a distinct message. Hence he says, at the end of seven days I received a word from the Lord Whence we gather, that he had been chosen before, and that the burden of an embassy was imposed upon him: meanwhile he stood, as it were, in suspense, because he did not distinctly understand what he was to say, and where he ought to begin. Hence it appears, that God acts by degrees towards his servants, so that he claims them for his own, then he shows them generally what duties and labors they have to discharge, and at length he sends them forth to the performance of their work, and the execution of their office. This we see was done in the case of our Prophet. For first he learned that he was chosen by God, afterwards he was admonished generally to behave himself courageously, and not to yield to any threats or terrors: at length God explained to him what commands he wished him to bear to the people. As yet God seems to speak but generally, but it is as if he announced that the time had come when the Prophet must gird himself to his work: hence he says, Son of man I have appointed thee a watchman of the house of Israel