God left him, to wit, to himself, and his own impotency and corruption. God withdrew from him those supplies and assistances of his Spirit which would certainly and effectually have kept him from that sin, and suffered Satan to tempt him, and him to fall into the sin of pride and ostentation. That he might know; either,
1. That God might know it. So it is spoken of God after the manner of men; whereof we have had many instances. Or,
2. That Hezekiah might know that he had infirmities and sins as well as virtues; and therefore that the great mercies which he had received were not the effects of his own merits, as he might be prone to believe, but of God's free grace.