I think ideally one would compel a personal aspect of the character to represent his motivation for that goal. In Harry's case he has many aspects that have the potential to do this, such as: "Wizard Private Eye", "The Temptation of Power", "My Mother’s Silver Pentacle", “He Did The Right Thing”, "Faerie Debts", "Lost Items Found", "In Love With Susan", "My Girlfriend Is A Semi-Vampire", "Warden of the White Council", "Perpetually Broke", and "Mentor to Molly Carpenter".
Edit: Damn, I forgot the best one; "Chivalry is not dead, Dammit!"
Of course I think you could also give the character an additional aspect as well, but I think using their motivation gives them a deep connection to the goal rather than simply a goal.