Dragon Ball Z, Season 9

Vegeta:
(to himself, while Goku is fighting against Kid Buu) Amazing. How do you do it, Kakarot? You've always been like this, ever since the day I first met you, always ready to meet the next challenge, even if it's bigger than you are. It was the same on Namek. You had improved so much that it made Recoome look like he was standing still! Your power had increased so dramatically since our battle on Earth that I thought you had done it. I thought... that you had become... a Super Saiyan! It tore me apart! How could a low class soldier accomplish so easily what I, I had struggled my whole life to achieve? After three millenia it has finally happened! A new Super Saiyan has emerged! And somehow, I have become this pauper's witness! Then, at last, it happened. I too, transformed. After living every moment of every day for the singular purpose of surpassing you, I finally became a Super Saiyan myself. The prince had reclaimed his throne and fulfilled his destiny! But no matter how strong I became, your power still exceeded mine. At first I thought it was your loved ones, that it was your instinct to protect them that spurred you on, and pushed you beyond your limits. But then I found myself with a family of my own. And my power didn't increase at all... I used to fight for the sheer pleasure of it, for the thrill of the hunt! Oh, I had the strength unmeasurable. I spared no one. And yet, you showed mercy to everyone, even your fiercest enemies... even me! Yet you never fought to kill, or for revenge, only to test your limits, and to push yourself beyond them, to become the strongest you could possibly be. How can a Saiyan fight like that and at the same time be so gentle that he wouldn't hurt a fly? Oh, it makes me angry just thinking about it! But, perhaps it is my anger that has made me blind to the truth for so long. I see it now, this day has made it all too clear. You're better than me, Kakarot. You are the best.