Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.
Ver. 20. Behold, I stand] Christ stands, he doth not sit; now while a man is standing he is going. Christ is but a while with men in the opportunities of grace; he will not always wait their leisure. The Church sought him (when once gone) with many a heavy heart, Cant. iii.
And knock] By the hammer of my word and hand of my Spirit.
And open the door, &c.] sc. By teachableness and obedience. This is not spoken of the first act of conversion (quae gratuita est et inopinata), but of the consequences of it; in which man, who being dead hath been made alive, ought to co-operate with God's grace.