The Greek adjective energes means active, effective, or powerfully at work — producing its intended result. It is the root of the English word 'energy' and 'energize.' It describes something not merely potential but actually operative and productive.
Energes appears in two key New Testament texts describing divine power at work. Hebrews 4:12 declares the word of God is 'living and active (energes), sharper than any two-edged sword' — not merely a record of past speech but a currently operative, penetrating force. Philemon 6 prays that faith 'may become effective (energes) in the knowledge of every good thing.' The related verb energeo (to work, be active) is used by Paul for God's working in believers (Philippians 2:13), for the Spirit distributing gifts (1 Corinthians 12:11), and for faith working through love (Galatians 5:6). Biblical 'effectiveness' is always grounded in divine energy, not human effort.