It's not Kathryn Kuhlman, but the Holy Spirit

Then he answered and spake unto me, saying, This is the word of the LORD unto Zerubbabel, saying, Not by might, nor by power, but by my spirit, saith the LORD of hosts.

Kathryn Kuhlman A Tribute

Zechariah 4:6
So he said to me, "This is the word of the LORD to Zerubbabel: 'Not by might nor by power, but by my Spirit,' says the LORD Almighty.

The Kathryn Kuhlman Foundation