The following definition of friendship appears on page 64 of Dr. Sadler's book, "The Mind at Mischief." He is reported to have been given this definition verbatim by the Midwayers and given permission to include it in his book.
"Friendship is the first and basic human conviction. It is more than an emotion, it is greater than an impulse, it transcends a sentiment. There is something profound about friendship at its best. It is undoubtedly based on the sentiment of love, and has in association with it many other emotions, including, no doubt, both sympathy and respect. Friendship is the equivalent of love plus loyalty and more or less of the sex-element. It is so influential in human experience that there appear to be no lengths to which it will not go to assert itself and to justify its existence."