"“The great day of the Lord is near, it is near, and hasteth greatly.” Zephaniah 1:14 . To every worker I would say: Go forth in humble faith, and the Lord will go with you. But watch unto prayer. This is the science of your labor. The power is of God. Work in dependence upon Him, remembering that you are laborers together with Him. He is your Helper. Your strength is from Him. He will be your wisdom, your righteousness, your sanctification, your redemption. Wear the yoke of Christ, daily learning of Him His meekness and lowliness. He will be your Comfort, your Rest. 7T 272.3"
"The great day of the Lord is near, it is near, and hasteth greatly, even the voice of the day of the Lord: the mighty man shall cry there bitterly."
Ellen White directly references Zephaniah 1:14 in this passage.