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O filósofo estuda o bom e o mau.

O filósofo estuda o bom e o mau.
The philosopher studies the good and the bad.
From Lesson 270:Noun-like adjectives (o bom, o mau)·Portuguese (Portugal)

Questions & Answers about O filósofo estuda o bom e o mau.

Why do we use the article o right before the adjectives bom and mau?
By putting the masculine singular article o in front of an adjective, you turn it into a noun that represents a general or abstract concept. This is the main way to say "the good" (o bom) or "the bad" (o mau) when talking about concepts rather than specific items.
Why is it o bom e o mau instead of o bem e o mal?
They are similar, but have a slight difference. Bem and mal often translate to the absolute moral concepts of "good and evil". Here, using the nominalized adjectives o bom and o mau refers more broadly to "the good things" and "the bad things" or the positive and negative aspects of life.
Could I use the feminine article a to make these abstract concepts, like a boa e a má?
No, to create a general, abstract noun from an adjective, you must always use the masculine singular o. If you used a boa, a Portuguese speaker would assume you are referring back to a specific feminine noun that was just mentioned (like "the good idea" or "the good woman"), rather than the general concept of "what is good".
Do I really need to repeat the o before mau, or could I just say estuda o bom e mau?
You need to repeat it. If you say o bom e o mau, you are clearly talking about two separate, contrasting concepts. If you dropped the second article and said o bom e mau, it would sound like you are describing one single concept that is simultaneously good and bad.

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