What does "you'll never plow a field without turning it over in your mind" mean?

Critical reading what do you think keats means in these lines from "when i have fears that i may cease to be"? i may never live to trace / their shadows, with the magic hand of chance a. i may never live to paint pictures of them. b. i may never have a chance to look at them again. c. i may never leave the shadows as long as i live. d. i may never live to write about them. select the best answer from the choices provided