I Am Mine said:
Who was the Germerican who told Wood not to give all for country and save it for club?
Good advice for a young player IMO. Whether they say it explicitly or not, everyone has this attitude when the rubber meets the road.
If international games were more important, you'd see guys retire from their clubs to save their bodies for their country (but instead you see the opposite); or you'd see guys take a week off from their clubs before international breaks so they can rest for their country (but instead, players who are fatigued/injured will use international breaks to rest for their club).
Even at the club level, a guy isn't gonna go full throttle against a relegation-tier club if there's a champions league match 3 days later.
It's nice to say "Always give 100%" but it's not practical.