The soil of your heart and mind is much like the garden soil. A seed planted in dry, shallow soil will burst forth, and quickly fade away. But a thought planted deep in fertile ground that is carefully watered and nurtured, may take time to appear. But like a mighty tree its roots will dig deep, and its branches high into the heaven will grow. Becoming so firm and secure, that only the mightiest storm and determined army can uproot it from heart and mind.
Wow, if that is the case, I certainly hope that vain thoughts never make it past the shallow surface and only that which is worth holding onto finds its way to the rich soil. Because I sure would hate to have to struggle so hard to pull up a useless, mind clogging tree from my life.