From this vantage point you will have gained the insight into that which very few have known.

Strictly speaking, the comma is necessary, though many writers lazily leave it out with short introductory phrases.

Do you put commas around "therefore" when it's mid-sentence? For example:

He, therefore, did not know what he was doing.

She had nothing but good intentions, and, therefore, there was no mens rea.

SnarfDo you put commas around "therefore" when it's mid-sentence? For example:
He, therefore, did not know what he was doing.

You certainly could, but I personally, and idiosyncratically, wouldn’t in this particular sentence. Inconsistently, I would use commas around however.

SnarfShe had nothing but good intentions, a

I have another comma query, actually, that I get confused about sometimes:

Not surprisingly, everything that I expected to find in it, I found, in particularly the parts about the aforementioned ideology of the time.

Should there be a comma after "particularly"?

Thanks.

I would not use a comma before I found, and I would invert in particular and use a comma before it.

Not surprisingly, everything that I expected to find in it I found, particularly in the parts about the aforementioned ideology of the time.

In fact, this reads much better:

Not surprisingly, I found everything that I expected to find, particularly

But what if the sentence were something like this?

Not surprisingly, I found in it everything that I expected to find, in particularly Nazism's fear-tactics of Aryan bigotry.

Is that fine without a comma after "particularly" or would you just change things around again?

Leave the comma and invert the phrase. It is best to place such modifiers outside prepositional phrases, not within.

“Do you like being at the center of attention?”
“Not in particularly,” Paul says.

Is that the right use of "in particularly" or should the "in" be omitted? Or does it not matter?

In is wrong there. Get rid of it.

“We just need a type of work with a type of people that suit us best, and which allows us to move from place to place.”

Should that rather be "the type" and "suit" be "suits"?

Thanks.