The Apostle Paul wrote unto Timothy and told him to "hold fast the form of sound words, which thou hast heard." The word form in this verse means pattern. The word sound means healthy, but in reference to the words spoken by Paul it means true and in-corrupt doctrine. As we realize the meaning of these words, we find that Paul instructed Timothy to hold to the set standard. There was a pattern that Timothy had to follow and he was not to stray from it.
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