Here at the café, we believe that coffee is life. We know that students need energy for their early morning classes, so we must be fast. Never forget that time is money!

When we talk about uncountable nouns (like coffee or time) or plural countable nouns (like students) in a general sense, we use the zero article (no article at all).

We would only use "the" if we were talking about specific instances, like "the coffee in this cup" or "the students at that table."