Sorry, it's not Shakespeare. But it's about KDB, that I'm sure of:
And, says Mrs. Mountstuart, while grand phrases were mouthing round about him: “You see he has a leg”.
That you saw, of course. But after she had spoken you saw much more.
(from The Egoist, by George Meredith).
As for Shakespeare, well, for José Mourinho, I always presumed the Bard was thinking of him when he penned this:
“I will do such things—What they are yet I know not, but they shall be the terrors of the earth!” (Lear, II.iv. 280-282)