It's not one quote, it's the entire point of the series, bookended from the very first season when he turned down billionaires who offered to bail him out, all the way to the finale when Walt comes clean and admits the whole thing was about him.
Saying 'he didn't spend the money on himself' is irrelevant, making the money for his family was just the excuse he used to go on his insane ego binge.
No, making the money for his family was the whole reason for taking the terrible risks he took. He understood his handicapped son would have high medical bills.he wanted his two children to be able to afford college, etc. If he wanted to be greedy he could have spent the money on himself. Instead he went to incredible lengths to make sure the money would be given to his son. If you don't realize what an amazing help that was to them for him to take all those risks so he could earn a substantial amount of money in a short time, you just don't understand it takes money to live. I'm sure it took even more money for his handicapped son with his medical costs even more money to live than most people.
What "ego binge" are you referring to"? Do you think associating with the absolute dregs of society was fulfilling his life's dream and therefore satisfying his ego? The only thing in his favor is it's a consensual crime so it's not nearly as bad as being a rapist for example. It's still far from noble.
On whom he spent the money has all the relevance in the world!