Haggai 1:13

Then spake Haggai - He was the Lord's messenger, and he came with the Lord's message, and consequently he came with authority. He is called יהוה מלאך malach Yehovah , the angel of Jehovah, just as the pastors of the seven Asiatic churches are called Angels of the Churches, Revelation 1:2 .

I am with you, saith the Lord - Here was high encouragement. What may not a man do when God is his helper?