In Exodus 7:7, eighty signifies the state and quality of the Law, since it applies to Moses. Also, 80, like 40, can represent a state of temptation, when we face and battle our desires for evil – and that it can also be looked at as the product of eight and 10, combining the meanings of those two numbers. Eight generally represents a beginning state (the eighth day is the first of a new week) and 10 can represent either a state of fullness or what are called "remains" – true ideas and desires for good implanted deep within us by the Lord in infancy, which can react with other good and truths as we grow. See Arcana Coelestia 7284.

7284. 'And Moses was a son of eighty years' means the state and essential nature of the law from God. This is clear from the representation of 'Moses' as the law from God, dealt with in 6771, 6827; and from the meaning of 'eighty years as the state and essential nature of the law from God, that is to say, among those who belonged to the spiritual Church, at the first time of visitation. What is meant specifically by 'eighty' cannot be stated because it entails the entire state and nature of the law from God among them at that time. 'Eighty' can mean a state of temptations, see 1963, and when it does so it entails the same meaning as forty. But because it is also the product of ten multiplied by eight, the meaning of eighty must be sought from these numbers as well. For what is meant by ten, see 576, 1906, 1988, 2284, 3107, 4638; and for what is meant by eight, 2044, 2866. In general all numbers serve to mean spiritual realities, and more particularly the states and essential nature of those realities, see 482, 487, 575, 647, 648, 755, 813, 1963, 1988, 2075, 2252, 3252, 4264, 4495, 4670, 5265, 5191, 5335, 5708, 6175.