Here is a quote said by Candy, after his dog is shot:
"When they can't use me here I wisht somebody’d shoot me. But they won’t do nothing like that. I won’t have no place to go, an’ I can’t get no more jobs.”
Candy feels like his days are numbered. He is weak because his not a complete man, and if he can't work on the farm, he can't make money. There will be no way to survive.
This is a quote by Crooks to George:
“You got George. You know he’s goin’ to come back. S’pose you didn’t have nobody. Sure you could play horseshoes till it got dark, but then you got to read books. Books ain’t no good. A guy needs somebody - to be near him.” He whined, “A guy goes nuts if he ain’t got nobody. . . . a guy gets too lonely an’ he gets sick.”
Crooks feels weak because he doesn't have a buddy, someone to watch out for him or just to pal around with. He is lonely and unprotected.
This following quote emphasizes that he is unprotected:
“Nigger, I could have you strung up on a tree so easy it ain’t even funny.”
Curley's wife says this. She is underlining the fact that Crooks is always on eggshells, never knowing when someone will come after him.