From the Codex Atlanticus, this is a letter that Leonardo da Vinci wrote in 1482 to the Duke of Milan advertising his services as a "skilled contriver of instruments of war". From the translation:

6. I have means by secret and tortuous mines and ways, made without noise, to reach a designated spot, even if it were needed to pass under a trench or a river.

So, Leonardo was pretty much Q from the Bond films or Lucius Fox from Batman. But the artist was in there as well...at the bottom of his list, stuck in almost as an afterthought:

11. I can carry out sculpture in marble, bronze, or clay, and also I can do in painting whatever may be done, as well as any other, be he who he may.