@Whateverist, do you not believe that non material things exist? For example gravity? Mathematics? Laws of logic? Truth is fact, by definition. Do you not believe in facts? These are all in fact immaterial.
@Irrational, see above. If all the vessels capable of interpretation disapeared, these immaterial laws would still govern the universe.
@FatAndFaithless, "conformity with fact or reality" source below. My apologies i should have been more clear
Recources:
https://www.scientificamerican.com/artic...h-excerpt/
http://www.dictionary.com/browse/truth
@Irrational, see above. If all the vessels capable of interpretation disapeared, these immaterial laws would still govern the universe.
@FatAndFaithless, "conformity with fact or reality" source below. My apologies i should have been more clear

Recources:
https://www.scientificamerican.com/artic...h-excerpt/
http://www.dictionary.com/browse/truth