Tiago 3:3-8 - Bíblia Online

Behold, we put bits in the horses' mouths, so that they may obey us, and we turn about their whole body. 
Behold also the ships being so great, and driven by fierce winds, yet they are turned about with a very small rudder, where the impulse of him steering desires. 
Even so the tongue is a little member and boasts great things. Behold how little a fire kindles how large a forest! 
And the tongue [is] a fire, a world of iniquity. So the tongue is set among our members, spotting all the body and inflaming the course of nature, and being inflamed by hell. 
For every kind of animals, and of birds, and of reptiles, and of sea-animals, is tamed, and has been tamed by mankind. 
But no one can tame the tongue, [it is] an unruly evil, full of deadly poison. 

Tiago 4

Behold, we put bits in the horses' mouths, so that they may obey us, and we turn about their whole body. 
Behold also the ships being so great, and driven by fierce winds, yet they are turned about with a very small rudder, where the impulse of him steering desires. 
Even so the tongue is a little member and boasts great things. Behold how little a fire kindles how large a forest! 
And the tongue [is] a fire, a world of iniquity. So the tongue is set among our members, spotting all the body and inflaming the course of nature, and being inflamed by hell. 
For every kind of animals, and of birds, and of reptiles, and of sea-animals, is tamed, and has been tamed by mankind. 
But no one can tame the tongue, [it is] an unruly evil, full of deadly poison. 

Tiago 4