See the previous chapter, at 6:22, where it is said twice of Noah that he 'did', whereas in this verse it is said only once. In that verse the name 'God' is used, but in this 'Jehovah'. The reason is that the previous chapter deals with things of the understanding, the present with those of the will. Things of the understanding view those of the will as things different and separate from themselves, but those of the will view those of the understanding as things united to themselves or as a unity, for the understanding has its being from the will. This is why the verb 'to do' is used twice in 6:22 but only once at this point, and also why the name 'God' is used there but 'Jehovah' here.