The mind and body can be likened to a garden,
which may be intelligently cultivated or allowed to grow wild;
but whether cultivated or neglected, it must and will bring forth. 
If no useful seeds are put into it, then an abundance of useless weed-seeds will fall thereon, and continue to produce their kind.
Just as a gardener cultivates their plot, keeping it free from weeds, and growing the flowers and fruits which it requires, so may they tend the garden of the mind, weeding out all the wrong, useless, and impure thoughts, and cultivating towards perfection the flowers and fruits of the righteous, useful and pure.
By pursuing this process, sooner or later one discovers that they are the master-gardener of their soul, the director of their life. They also reveal, within themselves, the laws of thought, and they understand, with ever increasing accuracy, how the forces and elements operate in the shaping of their character, circumstances, and destiny.