30 Jesus said, “How can I describe the Kingdom of God? What story should I use to illustrate it? 31 It is like a mustard seed planted in the ground. It is the smallest of all seeds, 32 but it becomes the largest of all garden plants; it grows long branches, and birds can make nests in its shade.” — Mark 4:30-32 NLT
Earlier in this chapter, Jesus had told His disciples that they were permitted to understand the secret of the Kingdom of God. He also stated that there would be some who would hear and refuse to believe (outsiders) and they would not be able to understand His teachings in the parables that He used (Mark 4:11,12). So, if the disciples were permitted to understand the Kingdom of God, then so can we understand it. Jesus told Nicodemus to enter the Kingdom that it was necessary for him to be born again. So, we become a part of the Kingdom of God when we receive Christ as our Savior. In doing so, we become eligible for all the benefits of that Kingdom here and now, not just in the future. As the birds nest in the shade of the mustard tree, so we live under the umbrella of God’s protection now. Right now, it is a spiritual Kingdom inside of us. When Jesus comes back, He will establish a Kingdom here on earth that will encompass all of His creation and creatures except those that refuse to hear and believe (Daniel 2:44, Rev.11:15). We are preparing to live in that Kingdom in our present life and one day that process will be completed when we are changed into immortal beings (1 Cor 15:50-53). Jesus taught us to pray “may Your will be done on earth even as it is in heaven”. So, while we are preparing for eternity, we live with the assurance that the hope that we have will one day be fulfilled. And it will be so — His will “will be done on earth as it is in heaven”. That is why we end our prayers with “Amen” which means “let it be so”. Partially now and completely in the future.