SHAFAQNA – It is narrated from Imam Sajjad (AS) who said: Talking nicely (to others) will increase wealth/assets, and will increase sustenance, and will delay death, as well as will make the human being popular with his/her family and relatives and others, and will take him/her to paradise [1]. Of course the talk must be according to religious standards and be expressed in a pleasant manner. According to Imam Sajjad (AS) this kind of talking will have rewards for both this world and the hereafter (next world).
[1] Amaali, Sheikh Sadooq, Page 50.