Definite articles for abstract concepts
English speakers usually drop the article when talking about general or abstract ideas. We say "Love is blind" or "Time is money". In Italian, however, these broad concepts require a definite article.
Words representing abstract concepts, such as amore, tempo, and vita, almost always need their definite articles when you speak about them in a general sense.
When an abstract noun is the subject of a sentence, or when you are talking about it as a whole, complete concept, you must include the definite article (il, la, l', etc.). This applies to massive, sweeping concepts like libertà and pace, as well as universal experiences like vita.
This same rule applies to academic subjects, broad fields of study, and personal qualities. Words like storia, arte, scienza, and pazienza all need a definite article when discussed generally.
It is important to note that abstract nouns do not take an article in every single situation. The rule applies when you are talking about things in general. When these words are part of certain fixed expressions, especially with verbs like avere or cercare, or after certain prepositions like con, the article is dropped.
For instance, you use the article for paura when making a general statement, but you drop it in the fixed phrase avere paura. Similarly, lavoro drops the article in the phrase cercare lavoro.
As a rule of thumb, if you are talking about an abstract concept or a general category as a whole, especially as the subject of your sentence, you need to use a definite article in Italian.