Again, though they are said to be mighty in power, yet it is with this limitation, that they are not omnipotent. There are some things, which are the effects of divine power, that angels are excluded from, as being too great for them; accordingly they were not employed in creating any part of the world, nor do they uphold it; for as it is a glory peculiar to God, _to be the Creator of the ends of the earth_, so he, exclusively of all others, is said _to uphold all things by the word of his power_. And to this we may add, that we have no ground to conclude, that they are employed in the hand of providence, to maintain that constant and regular motion, that there is in the celestial bodies, as some of the ancient philosophers[28] have seemed to assert; for this is the immediate work of God, without the agency of any creature subservient thereunto. Again, to this let me add, that how great soever their power is, they cannot change the heart of man, take away the heart of stone, and give a heart of flesh; or implant that principle of spiritual life and grace in the souls of men, whereby they are said to be _made partakers of a divine nature_, or _created in Christ Jesus unto good works;_ for that is ascribed to the exceeding greatness of the divine power, and it is a peculiar glory belonging to the Holy Spirit, whereby believers are said to be born from above; this therefore is too great for the power of angels to effect. VI. We have an account of the work or employment of angels; it is said, they execute the commands of God, and praise his name. The former of these will be more particularly considered, under a following answer,[29] when we are led to speak of their being employed by God, at his pleasure, in the administration of his power, mercy and justice; and therefore we shall now consider them as engaged in the noble and delightful work of praise; they praise his name. For this end they were created; and, being perfectly holy and happy, they are fitted for, and in the highest degree, devoted to this service. This work was begun by them as soon as ever they had a being: _they sang together_, and celebrated his praise in the beginning of the creation, Job xxxviii. 7.