The hearer of the word, just goes for the promise. They do not do any prepraration they just jump right in ready to receive the prize.
The doer of the word, hears the word and does the prepration needed to receive the promise. After getting themselves prepared for the promise, they receive the promise.
To earn a Medical Degree, you must follow the set program of studies and take the required courses/labs. The degree is the promise for completing course.
To whom much is given, much is required.
Are you a hearer or a doer of the Word?
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