Ya'akov 3:5-6, 8-9

So also the lashon (tongue), an evar katon (small member) speaks of RAVREVAN (boastful things). Hinei, an eish ketanah (small fire) and yet how great a forest it can set ablaze! And the lashon is an Eish, the lashon is made an Olam HaAvel (World of Iniquity) among our evarim (members), defiling with a stain kol haGuf (whole body), and setting ablaze the course of life, and is itself set by eish in Gehinnom.

But the Lashon no one of Bnei Adam is able to tame, an uncontrollable ra'ah (evil), full of deadly zuhamah (contamination). With this we say a bracha to HASHEM, Adoneinu and Avoteinu, and with this we put a kelalah (curse) on Bnei Adam, who have been created according to the demut Elohim.