“It's impossible to be loyal to your family, your friends, your country, and your principles, all at the same time.”

Not true!

This is why "true men", men of valour and honour, can only have one master.

Do a quick survey of your friends and family. If they don't aling with your beliefs then, for the sake of your health and sanity, abandon them and start anew.

It all depends on how you define loyal. A legal definition would be: a faithful fidelity to law or "Legal; according to law" (Bouvier's Law Dictionary). When one is consistent with (loyal to) natural law, relationships may seemingly vary as circumstances differ. When an individual believes they are the law or, man can create law, an absolute alignment varies as to perspective. By way of example: when family is considered one god / law maker and, a friend - another god / law maker and one's country - another equal or superior god / law maker, the quote (demanding a faithful obedience and unwavering support) would be somewhat accurate.

You can not serve three masters.

Loyalty is not always perceived as friendship. Truth can be shattering in a glass room.