Answer: The expression is used in the Gospels and in the book of Revelation. It was an idiomatic statement teaching this: Those who have the capacity to understand what is being taught should therefore heed what is being taught, but also apply the teaching and obey any commandments contained therein.
For example, in the seven letters to the seven churches, there are specific admonitions given. The members of those local churches who have the spiritual capacity to understand are therefore to act upon those very admonitions.
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Arnold Answers is a bi-weekly Q & A with founder and director of Ariel Ministries, Dr. Arnold G. Fruchtenbaum.