The law unsealed

In sum, this Commandment holdeth forth these three things. 1. That God will not only be served inwardly in the heart, by good thoughts and intentions (which is prescribed in the first Commandment) but also outwardly in the confessing him before men, in external service and worship, in words and gestures suitable; for the forbidding this sort of external gestures, worshipping and bowing before Idols, doth include the contrary affirmative in all its kinds (according to the first Rule before-mentioned for the right understanding of all the Commandments.) Thus it taketh in all Ordinances of Word, Prayer, Sacraments, Ceremonies, &c. and failing in these, breaketh this Commandment, when even they are not rightly gone about.

2. It holdeth forth this, that in that external service and worship, God will not have men following their own humour, but will have them to walk by the Rule given, or to be given by him to them, and otherwise it is in vain whatever worship men perform to him, Matth. 15. 9. Hence it is said here, Thou shalt not make to thy self; that is, at thy own pleasure, without my Command, otherwise what is by Gods Command is made to him; and this is to be extended to all Ordinances, yea both to the worship it self, and also to the manner of that worship, all is to be done according to Gods Command only.

3. It holdeth forth a spiritual service due to God, or that we should be spiritual in all external service, there should not be in us any carnal apprehensions of God, as if he were like any thing that we could imagine, Acts 17. 29. as is fully clear from Deut. 4. 15