7316. 'Behold, I strike with the rod which is in my hand upon the waters which are in the river' means power over falsities which are the result of illusions. This is clear from the meaning of 'the rod' as power, dealt with above in 7309; and from the meaning of 'the waters which are in the river' as falsities which are the result of illusions, also dealt with above, in 7307.
Arcana Coelestia #5410
5410. 'To buy grain from Egypt' means to make the good of truth its own through factual knowledge. This is clear from the meaning of 'buying' as making one's own, dealt with in 4397, 5374, 5406; from the meaning of 'grain' as the good of truth, dealt with in 5295; and from the meaning of 'Egypt' as factual knowledge, dealt with above in 5402.