Take no fault for your life what ye shall eat, or what ye shall drink, nor yet for your body for what ye shall put on. Is not the life, more than meat, and the body more than raiment? Luke 12:23
Worry is meditation perverted. Worry is the ability to mentally work and rework a truth, like turning a diamond to see all of its facets. it allows ideas to press more deeply into the soul, for reality to take on richness in the understanding that they would never have had without meditation.
The Greek word for meditation is taken from a unique ability of cows. Cows have four stomachs, and they eat, swallow, and then bring up what they have swallowed to chew it again when they choose. Human beings hear, think, store, and then bring up what they have heard to ponder it again at will. By doing so, they deepen understanding and allow truth to work its way into their consciousness and thus into the way they live.
Worry grows from the same process but is inspired by fear. Worry is the contemplation of non-realities in the light of fear. By worrying, people take the power of meditation and apply it to possible wrongs, to evils that may happen.
The great harm this does is that meditation has a power that is something like planting seeds. Meditation, and therefore worry, expands a subject, grows it in the soul. When people, inspired by fear, worry, they amplify their fears and grow them into strongholds that can rule their lives. Once the vicious cycle of fear-inspiring-worry and worry-increasing-fear gets started, it moves out to other areas of life like an occupying army.
To defeat worry, which is fear-inspired meditation, people have to use the power of meditation on good and noble themes to overcome the evil they are pondering. The task at hand is to think on different things. In a sense, you overcome evil with good in your thought life.
Take a moment to do an inventory of your worries. Make a list of them and find answers for them. And use the power of meditation (and action thereupon) to (stop and) overcome the encroachment of worry.
Text from: Words to Live By, L. Empson (ed.), S Mansfield (writer) (2004)