Sasuke cares about nothing but power. His life revolves around killing his brother and restoring his clan. He forces himself to remember this when his dreams are haunted by blue eyes and whiskered cheeks.
Naruto cares about everyone and everything equally. He has to get Sasuke back because he promised he would. That's all. He forces himself to remember this when he clutches a scratched hitaite in his hand and goes to bed.
Sasuke cares about nothing but power.
Naruto cares about everyone and everything equally.
They both know they are liars, but in their dreams, they tell the truth.