Spirit is non-physical.

But people should try to take less insult over the use of the word "thing".
Even a non-physical thing is a thing.
It's a beautifully simple Proto-Germanic-derived word

For instance "you are something else".
"You are the greatest thing imaginable".

Even non-physical Spirit is a thing.

The purest, truest, greatest thing.

But if it weren't a thing then it would be refered to as "nothing".
Only "nothingness", or "no-thing-ness" is not a "thing".

Sprit is a beautiful thing.