Tiago 3:3-8 - Bíblia Online

Now if we put the horses' bridles into their mouths that they may obey us, we turn about their whole body also. 
Look, the ships also, though they are so great and are driven by rough winds, are yet turned about by a very small rudder, where the impulse of the helmsman wills. 
So the tongue also is a little member, and boasts great things. Look, how much wood is kindled by how small a fire! 
And the tongue is a fire: the world of iniquity among our members is the tongue, which defiles the whole body, and sets on fire the wheel of nature, and is set on fire by hell. 
For every kind of beasts and birds, of creeping things and things in the sea, is tamed, and has been tamed by mankind. 
But the tongue no man can tame; [it is] a restless evil, [it is] full of deadly poison. 

Tiago 4

Now if we put the horses' bridles into their mouths that they may obey us, we turn about their whole body also. 
Look, the ships also, though they are so great and are driven by rough winds, are yet turned about by a very small rudder, where the impulse of the helmsman wills. 
So the tongue also is a little member, and boasts great things. Look, how much wood is kindled by how small a fire! 
And the tongue is a fire: the world of iniquity among our members is the tongue, which defiles the whole body, and sets on fire the wheel of nature, and is set on fire by hell. 
For every kind of beasts and birds, of creeping things and things in the sea, is tamed, and has been tamed by mankind. 
But the tongue no man can tame; [it is] a restless evil, [it is] full of deadly poison. 

Tiago 4