single word requests - Is it okay to say "that which"?


I know that there are certain times to use "that" (for restricting the noun) and certain times to use "which" (for adding information).


How about "that which"?:



Truth is that which conforms to reality.



"That" is here a demonstrative pronoun, but it seems that this usage of which is incorrect.


Is this okay?


If it's not correct, how could I restate that sentence?



Answer



Yes, it is absolutely OK to use 'that which' in that way.


Reference: My favourite quote:



That which does not kill us makes us stronger



Friedrich Nietzsche


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