Not for anything
Definition 1 of 1
Pro Tip 1/3Strong Refusal
Use it to express a very strong refusal or rejection of something. 
I would not divulge those secrets, not for anything.
Pro Tip 2/3Emotional Emphasis
Adds emotional weight, indicating something is precious or invaluable to you. 
I wouldn't miss my child's first steps, not for anything.
Pro Tip 3/3Hypothetical Situations
Often used to talk about hypothetical scenarios to emphasize a point. 
Not for anything would I trade my humble home for a mansion.