The effectiveness of a believer depends on how well they have been trained. Discipleship is training of the child of God into a soldier to carry out the will of The King, Jesus Christ. A few, well discipled soldiers of The Lord are more powerful than an army of ten thousand in the Kingdom of Darkness. 

“And Jesus came and spoke to them, saying, “All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age.” Amen.”

Matthew 28:18-20 NKJV