And it is in reference to this fact that the first philosophers appear to me to have affixed the names to things which they have given them. For they were wise men, and therefore they very speciously called the number ten the decade (τὴν δεκάδα), as being that which received every thing (ὡσανεὶ δεκάδα οὖσαν), from receiving (τοῦ δέχεσθαι) and containing every kind of number, and ratio connected with number, and every proportion, and harmony, and symphony.