As for the origin of one's wind-blown germs themselves, who shall say, as you ask, where THEY come from?
We have to go too far back, too far behind, to say.

Isn't it all we can say that they come from every quarter of heaven, that they are THERE at almost any turn of the road?
They accumulate, and we are always picking them over, selecting among them.
They are the breath of life--by which I mean that life, in its own way, breathes them upon us.

They are so, in a manner prescribed and imposed--floated into our minds by the current of life.

That reduces to imbecility the vain critic's quarrel, so often, with one's subject, when he hasn't the wit to accept it.

Will he point out then which other it should properly have been ?--his office being, essentially to point out.
Il en serait bien embarrasse.