in my book
In my opinion; from my perspective. In my book, playing with character is more important than winning. You're OK in my book, kid.
in one's book
Fig. according to one's own opinion. He's okay in my book. In my book, this is the best that money can buy.
in my bookin my opinion; to me.
in (one's) book
In one's opinion: In my book they both are wrong.