Behold also the ships, which though they be so great,.... Of so large a bulk, of such a prodigious size, and are such unwieldy vessels:and are driven of fierce winds; with great vehemence, rapidity, and swiftness:yet are they turned about with a very small helm, whithersoever the governor listeth; the helm, or tiller of a ship, is a beam or piece of timber fastened into the rudder, and so coming forward into the steerage, where he that stands at helm steers the ship , who is here called the governor; or "he that directs", as the word may be rendered; that is, that steers; the word for "helm" is translated rudder in Ac 27:40, and the helm or tiller is sometimes, though improperly, called the rudder itself ; and this is very small, in comparison of the bulk of the ship that is guided by it .
Aristotle calls it phdalion mikron, "a small helm", as the apostle here does, and accounts for it how large ships should be moved and steered by it. And so, though the tongue is to the rest of the body as a small helm to a large ship, yet, like that, it has great influence over the whole body, to check it when it is carrying away with the force of its appetites and passions; and so churches, societies, and bodies of Christians, which are large and numerous, and are like ships upon the ocean, tossed to and fro with tempests, driven by Satan's temptations and the world's persecution, and ready to be carried away with the wind of false doctrine, yet are influenced and directed aright by those that are at the helm, the faithful ministers of the word, who say to them, this is the way, walk in it.
Chambers's Cyclopedia, in the word "Helm". lb. in the word "Rudder". Quaest. Mechanic. c.