James 3:5-11 from the Complete Jewish Bible:
5 So too the tongue is a tiny part of the body, yet it boasts great things. See how a little fire sets a whole forest ablaze! 6 Yes, the tongue is a fire, a world of wickedness. The tongue is so placed in our body that it defiles every part of it, setting ablaze the whole of our life; and it is set on fire by Gei-Hinnom (Hell) itself. 7 For people have tamed and continue to tame all kinds of animals, birds, reptiles and sea creatures; 8 but the tongue no one can tame — it is an unstable and evil thing, full of death-dealing poison! 9 With it we bless Adonai, the Father; and with it we curse people, who were made in the image of God. 10 Out of the same mouth come blessing and cursing! Brothers, it isn’t right for things to be this way. CJB
34 O generation of vipers, how can you being evil, speak good things? for out of the abundance of the heart the mouth speaks. 35 A good man out of the good treasure of the heart brings forth good things: and an evil man out of the evil treasure brings forth evil things. KJV
These verses show us that we can control what comes from our mouths IF we control what is IN our hearts! So, the control issue is NOT about the tongue, but about the heart! Psalm 119:11 tells us this:
11 Thy word have I hid in mine heart, that I might not sin against thee. KJV
11 Your word have I laid up in my heart, that I might not sin against You. AMP
Shalom in Him!