Willpower

Tom has a lot of willpower.

He has enough willpower.

She has enough willpower.

It has enough willpower.

You've got willpower.

You've got a lot of willpower.

I don't think Tom has the willpower to do that.

I don't think I have the willpower to do that.

Tom doesn't have the willpower to do that.

I don't have the willpower to do that.

"A remarkable woman, gentlemen," said he, "a very noteworthy woman. I had prided myself that my willpower was the most powerful in the country--I had never met any to match it--but I do not mind admitting that, for firmness and tenacity, this lady is my equal. ...