When the Holy Spirit reveled to the author, Ernest Martin, a veterinarian with a medical background, that the spiritual birth was identical to the physical birth, this revelation became a life-changing experience. People are always asking and seeking miracles. What is a greater miracle than a sperm uniting with an ovum (egg) and becoming a living cell with the potential to develop into a human being? That living cell (zygote) does not have any resemblance to a fetus. From the process of fertilization to the growth process, it is all programmed in the zygote to divide and multiply and to eventually liken to its mother or dad or a combination of both.
Just like when we receive Jesus as our Savior, we become a whole spiritual being in the image of God. We don't look or act much like Jesus at this stage. We look more like the zygote, but we are complete in Jesus. If we desire the sincere milk of the Word and then progress to the meat of the Word, we will grow up into the full stature of Jesus. This process is so well-defined in the physical birth process that we can see how we grow as we spend time in the Word that we may eventually look and act like Jesus Christ.
What a miracle and life-changing event to understand the growth process ordained and carried out by God Almighty.