夫【fú】

夫fú at the head of a classical sentence announces that a general claim is coming – a premise, a maxim, the first step of an argument. It has no meaning of its own beyond "now, consider this", and English usually drops it. It is read fú, not the fū of 丈夫 "husband".

The statement after it is usually a 者…也 judgement or a pair of balanced clauses, and the next sentences argue from it.

In that line 夫 and 人 are two words: "now, a person…", not 夫人 "madam".

At the end: a sigh

After a statement or an interjection, 夫 turns it into an exclamation of feeling, close to 啊.

In modern writing

Modern prose doesn't open sentences with 夫. You meet it in quotations, in textbooks of classical prose, and in deliberately old-style writing such as inscriptions.