Like most numbers in the Bible, "six" can have various meanings depending on context, but has a couple that are primary. When used in relation to time -- six days, six hours, six years, etc. -- six generally represents a state of labor, struggle and conflict, especially the conflict involved with spiritual growth. The six days of creation, for instance, represent the stages we go through in our lives, working toward the peaceful seventh day, in which our evil desires are removed from us and we can rest. In most other references, six represents all desires for good and all the true ideas that come from those desires for good -- or in the contrary sense, all evil and all the resulting false thinking.

882. 'And he proceeded to send out the dove from the ark' means a state of receiving the goods and truths of faith. This is clear from what has been stated at verse 8 where nearly identical words appear, with the difference that there it is said 'he sent out the dove from himself', for the reason also given there, that at that time he himself was the source of every work of truth or good which he performed. That is to say, he believed that he performed it by his own power, meant by 'from himself'.