Imaam
Ibnul-Qayyim, رحمه الله said:
"If you would like to draw a
conclusion of what is contained in someone’s heart then use as a proof the
movements of his tongue, for surely, he will show you what is contained in his
heart regardless of whether he wants to or not."
Yahyaa
Ibn Mu’aadh رحمه الله said,
"The hearts are like pots. They
boil with that which they contain and their tongues are their ladles [i.e.
scooping spoons]. So look at a man when he speaks. His tongue will scoop out
for you that which is contained in his heart, whether it is sweet or bitter,
fresh or salty and other than that. And the flavor of his heart will become
clear to you from that which his tongue scoops out. 1