It's a commendable deed that man likes to deal with our Creator, to listen to His small still voice, or to always meditate upon Him. However, there's a great danger in doing these because the devil is deceitful. That does not surprise us, because even Satan changes himself to look like an angel of light (2 Cor. 11:14).
Even so, man should not rely on the feelings of his own heart. The heart is deceitful above all things, and desperately sick; who can understand it (Jer. 17:9).
The Scripture advises us not to believe every spirit, but test the spirits to see if they are from God (1 John 4:1). We're very lucky if hear a small still voice. To test the spirits, compare the voice with the Scripture to verify if it doesn't fall short. It is impossible for God to lie (Heb 6:18). Hence, He cannot contradict his written Word.