From experience. They had studied the teachings and promises of the Good News, and believed them! Of the coming age. Remember this was written to Jews. They called the age of the Messiah: the coming age. They would understand this to be speaking of the Christian age. Since the Holy Spirit was mentioned in Hebrews 6:4, MacKnight thinks the powers are the ability of the Good News to convert people to Christ. Compare Romans 1:16-17; 1 Thessalonians 1:9 and notes.

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Old Testament