Charles Spurgeon Commentary Mark 9:47

"And if thine eye cause thee to stumble, cast it out: it is good for thee to enter into the kingdom of God with one eye, rather than having two eyes to be cast into hell;" — Mark 9:47 (ASV)

And if your eye offends you, pluck it out:

Notice how severe our Savior is, how deep he goes. He does not say, "Shut it, cover it up with a green shade;" but, Pluck it out.