A few good Scripture passages to meditate when you fall or are tempted:
James 3: (My spiritual director made me read this one as a penance when I confessed sins of the tongue.)
2 … If anyone does not fall short in speech, he is a perfect man, able to bridle his whole body also.
3 If we put bits into the mouths of horses to make them obey us, we also guide their whole bodies.
4 It is the same with ships: even though they are so large and driven by fierce winds, they are steered by a very small rudder wherever the pilot’s inclination wishes.
5 In the same way the tongue is a small member and yet has great pretensions. Consider how small a fire can set a huge forest ablaze.
6 The tongue is also a fire. It exists among our members as a world of malice, defiling the whole body and setting the entire course of our lives on fire, itself set on fire by Gehenna.
7 For every kind of beast and bird, of reptile and sea creature, can be tamed and has been tamed by the human species,
8 but no human being can tame the tongue. It is a restless evil, full of deadly poison.
9 With it we bless the Lord and Father, and with it we curse human beings who are made in the likeness of God.
10 From the same mouth come blessing and cursing. This need not be so, my brothers.
11 Does a spring gush forth from the same opening both pure and brackish water?
12 Can a fig tree, my brothers, produce olives, or a grapevine figs? Neither can salt water yield fresh.
Ephesians 4:
29 No foul language should come out of your mouths, but only such as is good for needed edification, that it may impart grace to those who hear.
30 And do not grieve the holy Spirit of God, with which you were sealed for the day of redemption.
31 All bitterness, fury, anger, shouting, and reviling must be removed from you, along with all malice.
32 (And) be kind to one another, compassionate, forgiving one another as God has forgiven you in Christ.
Philippians 4:8:
Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is gracious, if there is any excellence and if there is anything worthy of praise, think about these things.