what is in the heart comes out of the mouth

 The saying "what is in the heart comes out of the mouth" means that a person's words and actions reflect their true feelings and beliefs, often found in religious teachings like the Bible. 

Here's a more detailed explanation:

Biblical Context:

The phrase is rooted in biblical teachings, particularly in Matthew 12:34 and Matthew 15:18, where Jesus states that "the mouth speaks what the heart is full of" and "what comes out of the mouth proceeds from the heart". 

Reflection of Inner State:

The saying suggests that a person's words and actions are a manifestation of their inner thoughts, values, and character. 

Positive and Negative Implications:

If a person's heart is filled with good things like love, kindness, and compassion, their words and actions will likely reflect that. Conversely, if their heart is filled with negativity, their words and actions may reflect that as well. 

Practical Application:

This saying serves as a reminder to cultivate a positive and loving heart, as our words and actions can have a significant impact on others. 

Example:

If a person consistently speaks unkind or hurtful words, it may be an indication that their heart is not filled with love and compassion, but rather with negativity or anger.