Efficacy As a Greek Term in the New Testament - But Somewhat Hidden in Its Translation - "Because the Holy Spirit always works with the Word and never apart from the Word, the Scriptures are effective and powerful."

 

The Byzantine Empire lasted 1100 years, using the Greek language and preserving the Apostolic Text (Traditional Text). The modern Bad Bible Boosters  - like the Beck Bad Bible - favor the frauds like Vaticanus and Sinaiticus.

Because the Holy Spirit always works with the Word and never apart from the Word, the Scriptures are effective and powerful. Below is the list for starters. The theme of efficacy goes beyond the word group itself.

Bible
Effectual, powerful: energes

1 Corinthians 16:9 (KJV) For a great door and effectual is opened unto me, and many adversaries.

Philemon 1:6 (KJV) That the communication of thy faith may become effectual by the acknowledging of every good thing which is in you in Christ Jesus.

Hebrews 4:12 (KJV) For the word of God quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and a discerner of the thoughts and intents of the heart.

Operations, working: energema

1 Corinthians 12:6 (KJV) And there are diversities of operations, but it is the same God which worketh all in all.

To show forth, work: energew

Matthew 14:2 (KJV) And said unto his servants, This is John the Baptist; he is risen from the dead; and therefore mighty works do show forth themselves in him.

Mark 6:14 (KJV) And king Herod heard ; (for his name was spread abroad:) and he said, That John the Baptist was risen from the dead, and therefore mighty works do show forth themselves in him.

Romans 7:5 (KJV) For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death.

1 Corinthians 12:6 (KJV) And there are diversities of operations, but it is the same God which worketh all in all.

1 Corinthians 12:11 (KJV) But all these worketh that one and the selfsame Spirit, dividing to every man severally as he will.

2 Corinthians 1:6 (KJV) And whether we be afflicted, for your consolation and salvation, which is effectual in the enduring of the same sufferings which we also suffer: or whether we be comforted, for your consolation and salvation.

2 Corinthians 4:12 (KJV) So then death worketh in us, but life in you.

Galatians 2:8 (KJV) (For he that wrought effectually in Peter to the apostleship of the circumcision, the same was mighty in me toward the Gentiles:)

Galatians 3:5 (KJV) He therefore that ministereth to you the Spirit, and worketh miracles among you, by the works of the law, or by the hearing of faith?

Galatians 5:6 (KJV) For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.

Ephesians 1:11 (KJV) In whom also we have obtained an inheritance, being predestinated according to the purpose of him who worketh all things after the counsel of his own will:

Ephesians 1:20 (KJV) Which he wrought in Christ, when he raised him from the dead, and set at his own right hand in the heavenly ,

Ephesians 2:2 (KJV) Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh
in the children of disobedience:

Ephesians 3:20‑21 (KJV) Now unto him that is able to do exceeding abundantly above all that we ask or think, according to the power that worketh in us, {21} Unto him glory in the church by Christ Jesus throughout all ages, world without end. Amen.

Philippians 2:13 (KJV) For it is God which worketh in you both to will and to do of good pleasure.

Colossians 1:29 (KJV) Whereunto I also labour, striving according to his working, which worketh in me mightily.

1 Thessalonians 2:13 (KJV) For this cause also thank we God without ceasing, because, when ye received the word of God which ye heard of us, ye received not the word of men, but as it is in truth, the word of God, which effectually worketh also in you that believe.

2 Thessalonians 2:7 (KJV) For the mystery of iniquity doth already work: only he who now letteth , until he be taken out of the way.

James 5:16 (KJV) Confess faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.

Effectual, working: energeia

Ephesians 1:19 (KJV) And what the exceeding greatness of his power to us‑ward who believe, according to the working of his mighty power,

Ephesians 3:7 (KJV) Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.

Ephesians 4:16 (KJV) From whom the whole body fitly joined together and compacted by that which every joint supplieth, according to the effectual working in the measure of every part, maketh increase of the body unto the edifying of itself in love.

Philippians 3:21 (KJV) Who shall change our vile body, that it may be fashioned like unto his glorious body, according to the working whereby he is able even to subdue all things unto himself.

Colossians 1:29 (KJV) Whereunto I also labour, striving according to his working, which worketh in me mightily.

Colossians 2:12 (KJV) Buried with him in baptism, wherein also ye are risen with through the faith of the operation of God, who hath raised him from the dead.

2 Thessalonians 2:9‑12 (KJV) , whose coming is after the working of Satan with all power and signs and lying wonders, {10} And with all deceivableness of unrighteousness in them that perish; because they received not the love of
the truth, that they might be saved. {11} And for this cause God shall send them strong delusion, that they should believe a lie: {12} That they all might be damned who believed not the truth, but had pleasure in unrighteousness. [Note 2
Thessalonians 2:7, the mystery of iniquity already at work.]

 Here is the concept expressed vividly.