This picture is a representation of the kingdom of God. The yellow field of mustard plants on lower part of picture is as Jesus founded the kingdom of God. It was like a field of straight rows and carefully cropped plants. The top half of the picture showing tall trees are mustard plants that went astray and became large trees producing little or no fruit. The trees represent today's condition of the body of Christ. The body of Christ today does not produce much fruit. These are the trees that Jesus said had the fowls of the air roosting in. Read the parable of the mustard seed in this book.
