To what extent can you be objective in observing others? How reliable could your opinions be about people with whom you’ve been spending decade after decade? You can never be sure what others hide behind their smile. You know no more of the humanity than what you’ve learned by observing and experimenting on yourself. This is the only real fundamental knowledge, which can only be refined, supplemented and confirmed by experience through the shock of others’ alien examples. This is external experience—experience concerning others.