Psalm 94:4 -- They pour out arrogant words;
    all the evildoers boast.

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Matthew 12:34 -- Brood of vipers! How can you speak good things when you are evil? For the mouth speaks from the overflow of the heart.

The pouring out from the heart, gives words.  Overflow...which provides for a concept of...the fact that one's heart overflows with something...  What it may be depends on what one chooses to put in one's own heart.  It must not be a mix, but as much of a pure form that respects and brings together and mirrors Father's Word.

Romans 6:13 -- And do not offer any parts of it to sin as weapons for unrighteousness. But as those who are alive from the dead, offer yourselves to God, and all the parts of yourselves to God as weapons for righteousness.

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Psalm 57:4 -- I am in the midst of lions; I lie down with those who devour men. Their teeth are spears and arrows; their tongues are sharp swords.

This helps to give a concept of where the weapon can lie within oneself, and what one's weapons are.  Even further, what a weapon can be, and what weapons can mean to a warrior.  In this, it helps to define what a warrior is when they use certain weapons, and what all their heart is composed of.