I wanted to learn Go, so I paid a go school and started to attend classes once a week with a pro. He was mean, and never let the students win the teaching games. This was frustrating to me, because I was thinking "Why am I paying to lose all the time?" I wished that I had a guardian angel or a ghost that could help me beat him really bad. It was at that moment that Hikaru no Go was born.
Interview at the International Go Symposium, 5 August 2012.
This is the universe! And I'm placing stones one by one on that. Like I'm increasing the number of stars one by one... I'm making the universe. It's like I'm a God. I'm going to become a God! On this Go Board.
In the anime, Hikaru says this when he plays in a Go tournament for the first time.
To link the far past, with the far future.
Hikaru's reason for playing Go (Volume 23, chapter 189)