"The good man out of the good treasure of his heart brings forth what is
good; and the evil man out of the evil treasure brings forth what is evil;
for his mouth speaks from that which fills his heart." Luke 6:25

In this Scripture we can see that the heart is the center of life, this
being so, there are certain things to be considered.
*The heart should be carefully guarded:
"Keep your heart with all diligence,
For out of it spring the issues of life." Proverbs 4:23

*The heart determines character:
"For as he thinks within himself, so he is." Proverbs 23:7

*The heart is a source of evil:
Explaining to Peter what He said to the multitude that offended the
Pharisees, Jesus said,
"Do you not understand that everything that goes into the mouth passes
into the stomach, and is eliminated?
But the things that proceed out of the mouth come from the heart, and
those defile the man." Matthew 15:17-18
(Read the whole account Vs. 1-20)

*Our opening verse tells us that the heart controls speech. Read it again.

*The heart is the source of faith:
"For with the heart man believes, resulting in righteousness, and with the
mouth he confesses, resulting in salvation." Romans 10:10

Our opening verse states 'for his mouth speaks that which fills he heart',
therefore, looking at the words of the good man, Scripture tells us in
Proverbs 16:23
"The heart of the wise teaches his mouth
And adds learning to his lips."

Considering wise words we see that:
*They are forcible:
"How forceful are right words!" Job 6:25a
"And a word spoken in due season, how good it is!" Proverbs 15:23b

*They are pleasant:
"Pleasant words are like a honeycomb.
Sweetness to the soul and health to the bones." Proverbs 16:24

*They are appropriate:
"A word fitly spoken is like apples of gold
In settings of silver." Proverbs 25:11

*They are gracious:
"The words of a wise man's mouth are gracious,
But the lips of a fool shall swallow him up." Ecclesiastes 10:12

*They are comforting:
"The Lord God has given Me
The tongue of the learned,
That I should know how to speak
A word in season to him who is weary." Isaiah 50:4

Scripture gives us warning against an evil heart and evil speaking:
"See to it, brothers, that none of you has a sinful, unbelieving heart that
turns away from the living God. But encourage one another daily."
Hebrews 3:12-13

"Let all bitterness, and wrath and anger, and clamor, and evil speaking
be put away from you, with all malice." Ephesians 4:31

"For he that will love life and see good days, let him refrain his tongue
from evil, and his lips that they speak no guile." 1 Peter 3:10

I encourage all of us to do a heart search spiritually and Scripturally that
we may be, say and do only those things that bring honor and glory to
our awesome Lord.

Blessings to all.