Think of your mind as a garden where you can intelligently cultivate it or allow it to run wild. Whether you tend to it or not something will grow there. If you don’t plant good seeds of thought, then a bunch of weeds will sprout up and like most weeds they can quickly turn a garden into a mess. Only with constant weeding and cultivating can the good seeds of thought continue to blossom until eventually there are more blossoms and fruit than weeds.
The weeds will still creep in from time to time to disturb you beautiful garden (mind) but with practice you become aware of it much quicker and like a master gardener you are able to weed out all the wrong, useless, and impure thoughts and cultivate toward perfection the flowers and fruits of right, useful and pure thoughts.
Why does this matter, because circumstances grow out of thought? Every thought – seed sown or allowed to take root there produces its own blossoming sooner or later into action and bearing its own harvest of opportunity and circumstance. You can be the master gardener of your thoughts and create your garden or let the weeds take root and see what happens. The choice is yours. You really do reap what you sow.