So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it. For ye shall go out with joy, and be led forth with peace: the mountains and the hills shall break forth before you into singing, and all the trees of the field shall clap their hands. Instead of the thorn shall come up the fir tree, and instead of the brier shall come up the myrtle tree: and it shall be to the LORD for a name, for an everlasting sign that shall not be cut off.
Our first 'promise' to consider and rejoice in fixes our eyes on the Word! As water penetrates the soil of our gardens and releases the potential of seeds, the Word penetrates the soil of our soul and produces the harvest God desires. Earlier in the passage, we are reminded that God's thoughts and ways far exceed our own. Nothing our life produces apart from His Word will compare. In fact, the contrast given later in the passage is pine trees and myrtle instead of thornbushes and briers! The soul production God desires is the glorious revelation of Himself that others' lives will be blessed as well. With our eyes turned toward God's Word, our ears tuned to His Word and our feet trodding the path lit by His Word, we are assured of 'going out in joy, being led forth in peace and hearing the rejoicing all around! God's Word, heard and heeded will produce great results in our lives and in the lives of those around us. He promises. We believe!