Unlimited Merits:

On the other hand, the reward for guarding one's tongue is great. Rabenu Yona writes in Shaarei Teshuva (Shaar 3, Ois 210) as follows: “Death and life are in the hand of the tongue, and those who love it will eat its fruits (Mishlei 18:21)." "Those who love it" refers to people who like to talk. The best advice for them is to "eat its fruits", meaning that they should only speak words of Torah and mussar, as well as words of friendliness to others, praise for good things, and criticism of bad things, but not to speak any pointless words. One can earn untold reward with his tongue, as the pasuk says, “Life is in the hands of the tongue." The Gemara says (Bava Basra 9B): "One who gives a donation to a poor person receives six blessings and one who calms him with words receives 12 blessings." The Maharsha explains that comforting a person with words is better than giving someone a donation without comforting him because the former is done with the body, while the later is done with one's money. We can learn from this the power of saying a "good vort" to a Jew in need of encouragement. Rabenu Bechaya (Parshas Metzorah) writes: "Since 'life and death are in the power of the tongue' (Mishlei 18:21), if one enjoys talking, he should use this pastime to earn reward by speaking about matters of wisdom, truth, and peace. If one does this, the more he talks, the more reward he will get."