The rain and snow come down to fill the land with growth, to cause it to flourish. At the root of a farmer’s success is precipitation. Without it he wouldn’t have income, wouldn’t live for lack of nourishment.
And so it is for a Christian.
Isaiah likens the Word of God to the rain and snow. Without the Word a Christian won’t be able to produce fruit. A Christian would lack nourishment, taking away the opportunity to thrive and flourish.
That’s how important God’s Word is to His children, His church. Treat it as a commodity that you can’t live without. Cherish it. Use it. Pray for it to be constant in your everyday life.