Of these difficulties, all that refer to the constitution of the universe may be dismissed (for they do not properly concern our present inquiry); but those that refer to human nature, and are intimately connected with man’s character and affections, we will discuss⁠—as, for instance, whether friendship can exist in all men, or whether it is impossible for men to be friends if they are bad, and whether there be one form of friendship or rather many. For those who suppose that there is only one kind of friendship, because it admits of degrees, go upon insufficient grounds. Things that differ in kind may differ also in degree. (But we have already spoken about this point. 216 )