Source: THE FREE DICTIONARY
DEFINITIONS:
SINE QUA NON: something that is essential before you can achieve something else
PART AND PARCEL: to be a feature of something, especially a feature that cannot be avoided:
SUM AND SUBSTANCE: The central or most important idea, aspect, or part of something; the essence or summary of something.
EXAMPLES:
Some consider a good education to be the sine qua non of a successful career.
An interest in children is a sine qua non of teaching
Dealing with tantrums is part and parcel of raising a toddler.
I'm afraid customer complaints are part and parcel of this job
The sum and substance of their platform is financial conservatism.
xbladefate25 Any differences between "sine qua non" "part and parcel" and "sum and substance"? Yes, there are differences. I think the dictionary definitions make that clear enough.
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xbladefate25 Any differences between "sine qua non" "part and parcel" and "sum and substance"?
Yes, there are differences. I think the dictionary definitions make that clear enough.
If one thing is the sine qua non (Latin: without that, nothing) of something else, then if you don't have the first thing, you can't logically have the other thing.