We have to choose between what is right, and what is easy.
It's our choices, more than anything, that show who we really are.
'It only put me in Gryffindor,' said Harry in a defeated voice, 'because I asked not to go in Slytherin...' 'Exactly' said Dumbledore, beaming once more. 'Which makes you very different from Tom Riddle. It is our choices, Harry, that show what we truly are, far more than our abilities.'
Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
But if it matters to you, you'll be able to choose Gryffindor over Slytherin. The Sorting Hat takes your choice into account." "Really?" "It did for me," said Harry. He had never told any of his children that before, and he saw the wonder in Albus's face when he said it.
Choice was dangerous: you had to forgo all other possibilities when you chose.
Where are you heading, if you’ve got the choice?” James lifted an invisible sword. “‘Gryffindor, where dwell the brave at heart!’ Like my dad.” Snape made a small, disparaging noise. James turned on him. “Got a problem with that?” “No,” said Snape, though his slight sneer said otherwise. “If you’d rather be brawny than brainy —” “Where’re you hoping to go, seeing as you’re neither?” interjected Sirius.
We Slytherins are brave, yes, but not stupid. For instance, given the choice, we will always choose to save our own necks.