My tongue has always been a challenge to tame.  Every time I think I'm doing well - I am rudefully awakened to reality.  The only thing I can do is hope in the Lord to give me the strength I need to do better :-)

I've pasted some good Proverbs regarding our words/tongues.  Be encouraged. 

Prov 10:19-21

19 In a multitude of words transgression is not lacking, but he who restrains his lips is prudent.

20 The tongues of those who are upright and in right standing with God are as choice silver; the minds of those who are wicked and out of harmony with God are of little value.

21 The lips of the [uncompromisingly] righteous feed and guide many, but fools die for want of understanding and heart.
Prov 10:31-32

31 The mouths of the righteous (those harmonious with God) bring forth skillful and godly Wisdom, but the perverse tongue shall be cut down [like a barren and rotten tree].

32 The lips of the [uncompromisingly] righteous know [and therefore utter] what is acceptable, but the mouth of the wicked knows [and therefore speaks only] what is obstinately willful and contrary.
Prov 12:18

18 There are those who speak rashly, like the piercing of a sword, but the tongue of the wise brings healing.
Prov 13:3

3 He who guards his mouth keeps his life, but he who opens wide his lips comes to ruin.
Prov 14:3

3 In the fool's own mouth is a rod [to shame] his pride, but the wise men's lips preserve them.
Prov 14:23

23 In all labor there is profit, but idle talk leads only to poverty.
Prov 15:1
15:1 A SOFT answer turns away wrath, but grievous words stir up anger. [Prov 25:15.] 
Prov 15:2

2 The tongue of the wise utters knowledge rightly, but the mouth of the [self-confident] fool pours out folly.
Prov 15:4

4 A gentle tongue [with its healing power] is a tree of life, but willful contrariness in it breaks down the spirit.
Prov 15:8

7 The lips of the wise disperse knowledge [sifting it as chaff from the grain]; not so the minds and hearts of the self-confident and foolish.
Prov 15:23

23 A man has joy in making an apt answer, and a word spoken at the right moment — how good it is!
Prov 15:26

26 The thoughts of the wicked are shamefully vile and exceedingly offensive to the Lord, but the words of the pure are pleasing words to Him.
Prov 15:28

28 The mind of the [uncompromisingly] righteous studies how to answer, but the mouth of the wicked pours out evil things. [1 Peter 3:15.] 
Prov 16:2
16:1 THE PLANS of the mind and orderly thinking belong to man, but from the Lord comes the [wise] answer of the tongue.
Prov 16:27

27 A worthless man devises and digs up mischief, and in his lips there is as a scorching fire.
Prov 17:7

7 Fine or arrogant speech does not befit [an empty-headed] fool — much less do lying lips befit a prince.
Prov 18:6-7

6 A [self-confident] fool's lips bring contention, and his mouth invites a beating.

7 A [self-confident] fool's mouth is his ruin, and his lips are a snare to himself.
Prov 18:20-21

20 A man's [moral] self shall be filled with the fruit of his mouth; and with the consequence of his words he must be satisfied [whether good or evil].

21 Death and life are in the power of the tongue, and they who indulge in it shall eat the fruit of it [for death or life]. [Matt 12:37.]