"it is my duty" reads to me like empty flavourtext - if i read right, something is your duty when it is useful and right and the option you have chosen to do. you may as well be saying "i do this because i have chosen to do it"..? it doesn't seem, well, useful to use "duty" as a justification on top of already having shown usefulness and correctness.
i like the word "useful" when talking philosophy. "is this a useful question to be asking?" and "is this a useful answer to the question?" are good to say to stay on track; often they would be followed by "well, what's the intended use to begin with?". (i used this trick a few days ago when discussing the inherent value of original vs forged art and descartesesque notions of perceived reality.)
If I show you how my new knife cuts through some wood, I may do so to allow you to admire the sharpness of the blade, rather than because I want two pieces of wood.
this totally happened with my bread knife and that pineapple at dinner yesterday. (i get that the article means if you are showing off your knife, you'd better eventually want to eat pineapple.)
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i like the word "useful" when talking philosophy. "is this a useful question to be asking?" and "is this a useful answer to the question?" are good to say to stay on track; often they would be followed by "well, what's the intended use to begin with?". (i used this trick a few days ago when discussing the inherent value of original vs forged art and descartesesque notions of perceived reality.)
If I show you how my new knife cuts through some wood, I may do so to allow you to admire the sharpness of the blade, rather than because I want two pieces of wood.
this totally happened with my bread knife and that pineapple at dinner yesterday. (i get that the article means if you are showing off your knife, you'd better eventually want to eat pineapple.)