We can use the article 'the' if we can say 'this/these' or 'that/those' instead:
(The) Love is blind
It is not true that marriage can fail
It is not possible to omit the article in appositions:
Madrid, the capital city of Spain, is an amazing city.
Many people are in need of water, an/the essential resource.
'Most' works as an article, so it cannot be combined with 'the':
I like the Iberian forests.
I like most Iberian forests.
I like most of the Iberian forests.
A/An - The - Some (English-Hilfen)
A/An - The - Zero article (MyEnglishPages)
Countable and Uncountable nouns (British Council)
Games:
Quizes (British Council)
Rally + countable and uncountable nouns (ESL Games)