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Listen at the door posts of your heart for the still small voice of God.
And thou shalt write them upon the door posts of thine house, and upon thy gates: Deuteronomy 11:20
And after the earthquake a fire; but the LORD was not in the fire: and after the fire a still small voice. 1 Kings 19:12
Did ever people hear the voice of God speaking out of the midst of the fire, as thou hast heard, and live? Deuteronomy 4:33

Let your heart decide what be truth and what is not truth.
And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment. Mark 12:30

For it is with the heart you can believe, love and feel joy.
For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. Romans 10:10

By their fruits you can discern what is of God and what is not of God.
Matthew 7:18  A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
19  Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20  Wherefore by their fruits ye shall know them.

Does the words generate peace or strife?
Let us therefore follow after the things which make for peace, and things wherewith one may edify another. Romans 14:19
A wrathful man stirreth up strife: but he that is slow to anger appeaseth strife. Proverbs 15:18

Love or hate?
According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love: Ephesians 1:4
But I say unto you which hear, Love your enemies, do good to them which hate you, Luke 6:27

Sadness or joy?
And now shall mine head be lifted up above mine enemies round about me: therefore will I offer in his tabernacle sacrifices of joy; I will sing, yea, I will sing praises unto the LORD. Psalms 27:6

Doubt or faith?
But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. Hebrews 11:6
For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith. Mark 11:23

If a voice comes to you in the darkness of night and brings turmoil and thoughts of worry, does that voice come from the God of peace and faith or does it come from the father of war and doubt?
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. 1 John 4:1

The voice of God is the Bread of Life and His Voice feeds the inner man and brings life everlasting.
And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst. John 6:35