(1) Emulation is the whetstone of wits.

(2) The finest edge is made with the blunt whetstone.

(3) Competition is the whetstone of talent.

(4) A fine - grained whetstone for giving a keen edge a cutting tool.

(5) With justice as its whetstone, the multiverse shall achieve perfection.

(6) A mind needs books like a sword needs a whetstone.

(7) A mind needs books as a sword needs a whetstone, if it is to keep its edge. George R.R. Martin 

(8) His brain seemed to seize up when Naseby was around, whereas Stitch sharpened it, like a whetstone.

(9) Hereabouts can be found, in quarry spoil(), the fine-grained whetstone once transported for use in steel manufacture.

(10) He w as filing arrow heads, and the sound of the metal on the whetstone set Burun's teeth on edge.

(11) Then sounds of England, the tinkle of the hammer on the anvil in the country smithy. The corncrake on the dewy morning. The sound of scythe against the whetstone.