Matius 12:34

12:34 Offspring of vipers! How are you able to say anything good, since you are evil? For the mouth speaks from what fills the heart.

Lukas 6:45

6:45 The good person out of the good treasury of his ¹  heart ²  produces good, and the evil person out of his evil treasury ³  produces evil, for his mouth speaks ⁴  from what fills ⁵  his heart.

Yakobus 3:6

3:6 And the tongue is a fire! The tongue represents ⁶  the world of wrongdoing among the parts of our bodies. It ⁷  pollutes the entire body and sets fire to the course of human existence – and is set on fire by hell. ⁸ 

[6:45]  ¹ tn Grk “the”; the Greek article has been translated here and in the following clause (“out of the evil”) as a possessive pronoun (ExSyn 215).

[6:45]  ² sn Mention of the heart shows that Jesus is not interested in what is done, but why. Motives are more important than actions for him.

[6:45]  ³ tn The word “treasury” is not repeated in the Greek text at this point, but is implied.

[6:45]  ⁴ sn What one utters from one’s mouth is especially singled out as the example of this principle. James seems to have known this teaching (Jas 1:26; 3:1-12).

[6:45]  ⁵ tn Grk “for out of the abundance of the heart his mouth speaks.”

[3:6]  ⁶ tn Grk “makes itself,” “is made.”

[3:6]  ⁷ tn Because of the length and complexity of the Greek sentence, a new sentence was started here in the translation.

[3:6]  ⁸ sn The word translated hell is “Gehenna” (γέεννα, geenna), a Greek transliteration of the Hebrew words ge hinnom (“Valley of Hinnom”). This was the valley along the south side of Jerusalem. In OT times it was used for human sacrifices to the pagan god Molech (cf. Jer 7:31; 19:5-6; 32:35), and it came to be used as a place where human excrement and rubbish were disposed of and burned. In the intertestamental period, it came to be used symbolically as the place of divine punishment (cf. 1 En. 27:2, 90:26; 4 Ezra 7:36).