“It is better to learn war early from friends, than late from enemies”
“A blow from your friend is better than a kiss from your enemy.”
“Preventing war is much better than protesting against the war. Protesting the war is too late.”
“It is better to learn late than never.”
“…but it is better to learn wisdom late than never to learn it at all.”
“A wise man gets more use from his enemies than a fool from his friends.”