Dr. Jekyll and Mr. Hyde
With reference to the AA big book
Here is the fellow who puzzle you. He is a real Dr. Jekyll and Mr. Hyde.
He is often perfectly sensible concerning everything except gambling.
He may be one of the finest fellows in the world.
Yet let him gamble and he becomes incredibly dishonest and selfish.
He often possesses special abilities, skills, and aptitudes, and has a promising career ahead of him. He uses his gifts to build up a bright future for his family and himself, and then pulls everything down himself.
With ref to NA basic text
While gambling, we lived in another world.
It seems like we were two people instead of one, like Dr. Jekyll and Mr. Hyde.
We tried very hard to fix our lives together;
we tried very hard to stay gamble free before our next gamble.
Sometimes we could stay gamble free very well,
but later, it was less important and more impossible.
In the end, Dr. Jekyll died and Mr. Hyde took over.