Found 4 verses containing Effective.
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1 Corinthians 16:9 (Show me 1 Corinthians 16)
for a wide door for effective work has opened to me, and there are many adversaries.

Philemon 1:6 (Show me Philemon 1)
and I pray that the sharing of your faith may become effective for the full knowledge of every good thing that is in us for the sake of Christ.[1]
[1]Or for Christ's service

James 5:16 (Show me James 5)
Therefore, confess your sins to one another and pray for one another, that you may be healed. The prayer of a righteous person has great power as it is working.[1]
[1]Or The effective prayer of a righteous person has great power

2 Peter 1:8 (Show me 2 Peter 1)
For if these qualities[1] are yours and are increasing, they keep you from being ineffective or unfruitful in the knowledge of our Lord Jesus Christ.
[1]Greek these things; also verses 9, 10, 12