“Out of the abundance of the heart, the mouth speaketh…(and actions proceed forth)”
When a person’s heart is filled with wickedness and evil, such a person will always find it difficult to read “positive” meaning into any “kind” act rendered to such a one; he/she will always take one’s goodwill as evil.
“O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.”
A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.