Menno Simons , whose reformation teachings eventually led to the Mennonite movement, wrote in 1541...
Besides this, when we were yet ungodly and enemies, He did not punish us as He did the angles that sinned, nor as the first depraved world, nor as Sodom and Gomorrah, nor as those who worshiped the calf, nor as those in the day of provocation, nor as the rebellious and adulterers, nor as those in the wilderness who acted contrary to His will and Word; for He destroyed all these. But us He spared through His great mercy, led us by His right hand, drew us by His goodness, renewed us by His Word, begat us by the Holy Ghost, and enlightened us by the clear light of His truth. Thus by His grace we bade farewell to the world, flesh, devil, and all and freely entered upon the path of peace, beneath the easy yoke of the Gospel. Methinks this is grace, if ever there was any.It seems that Christ pours out the empowerment of the Holy Spirit upon those who are committed as obedient witnesses. I don't mean those who are sure to knock on three doors a week, or those who are sure to spout off their memorized ABC's of the Gospel, for those things can be done out of duty so as to check off one's good deed for the day.
Dearest children, take heed. If now the gracious Father, according to His great mercy, has dealt so kindly with us and has manifested His love toward us without any merit on our part, then it is right and proper for us to love in return; to fear, praise, honor, and serve such a benevolent Lord, and merciful Father with all our powers; to be obedient to Him according to our little power.
What is meant by obedient witnesses is what seems to appear in the lives of these early believers--their lives were defined by Jesus. Their lives were defined by His life, His death, His resurrection, and His return. Their lives were defined by His commission and His command (Matthew 28:18-20 & Acts 1:8). Their lives were defined by the Kingdom of God. Their lives were defined by obedience to Jesus. Therefore, their lives were defined by the power of the Holy Spirit.
That first paragraph of Menno Simons says enough, doesn't it? "Methinks this is grace, if ever there was any." Isn't that grace enough to drive us in pursuit of a life defined by Jesus? The attitude for Spiritual power is obedient witness. I've got some things to work on...how about you?