A writer's subconscious is one of the filthiest places there are: as a matter of fact, you can find the whole world there.
Sailors have the cleanest bodies and the filthiest minds.
I loved being in Trainspotting and having to dive into the filthiest toilet in Scotland.
The Marines I have seen around the world have the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps!
I mean, I'll say the filthiest things in the world, but when it comes down to it, I'm kind of a prude.
The humble sinner will sometimes be interpreted as one of the filthiest in the eyes of man yet immersed in the eyes of God, and this is due to the volition of honesty regarding his own corruption.