“As you sow, so shall you reap.” This is mathematically accurate and true.
If you plant a turnip seed, nature doesn’t produce potatoes. If you plant corn, nature doesn’t make a mistake and bring you a giant oak tree.
On the same reasoning, if you or I plant thoughts of worry, the law will give us something to worry about, it will produce more and more circumstances to fulfill our focus, which is worry.
We experience what we are interested in. Plant the seeds you wish to reap. Plant joy and abundance and this you shall reap.