Zechariah 4:6-7

6 Then he answered and spoke to me, saying, "This is the word of Yahweh to Zerubbabel, saying, 'Not by might, nor by power, but by my Spirit,' says Yahweh of Hosts.  7 Who are you, great mountain? Before Zerubbabel you are a plain; and he will bring out the capstone with shouts of 'Grace, grace, to it!'"