“This Book of the Law shall not depart from your mouth, but you shall meditate in it day and night, that you may observe to do according to all that is written in it.”
This passage refers to the law of Moses, but today we relate it to the whole Scripture, which is useful for correcting, encouraging and strengthening so that we may reap the fruits (Psalm 1). By quoting the verse “So then faith comes by hearing, and hearing by the word of God” (Romans 11:17), we commit that what we hear shall not depart from our ears. In this case the exhortation is that it does not depart from our mouth. This refers to our conversations, which should focus on what the Scripture teaches. Often we speak things contrary to the Scripture, and then we wonder why God does not answer to our prayers. Our life can prosper only if His Word does not depart from our mouth (Proverbs 3:13; Proverbs 21:23; Matthew 15:18). The mouth says what is within us, if we declare unbelief in our heart then we lack of faith. We should learn to declare that the Lord is the Provider, who does not leave us nor forsake us. So it’s important that what we state with our mouth it’s also what we have in our heart otherwise we’re just hypocrites.
Meditate on the Word day and night does not mean to read or say it aloud, but it’s something deeper and even inner. Meditating it needs to go from reading or declaring the biblical text to listening it. Joshua was still in the desert when received such a word, underlying that God speaks in the place where there’s only silence (no words). Listening is the starting point of this meditation, that allows the Scripture to come into our heart and our mouth to declare by faith. Strengthen the ability to stop the thoughts, and not to be distracted or influenced, can help the sensitivity of the faith to perceive the sweet and gentle voice of God. When in the silence the answer comes it’s important to act with no hesitation and away from many doubts that come to attack the mind. Some times to act by faith we have to stop the thoughts, because His thoughts are not ours. Faith has to be thoughtless, as this is folly and not reason.