O Zion, that brings good tidings, get you up into the high mountain; O Jerusalem, that brings good tidings, lift up your voice with strength; lift it up, be not afraid; say unto the cities of Judah, Behold your God!
Read Chapter 40
Ambrose of Milan
AD 397
Ascend this mountain … not with physical steps but with more exalted deeds. Follow Christ so that you might be a mountain yourself, for there are mountains surrounding him. Look in the Gospel, and you will find that only the disciples went up the mountain with the Lord. - "Expositions on the Gospel of Luke 5.41"
For in the power of the Holy Spirit, by the will of the Father and the Son, Peter stood with the Eleven and, lifting up his voice (according to the text, “Lift up your voice with strength, you who bring good tidings to Jerusalem”), captured in the spiritual net of his words about three thousand souls. So great was the grace that worked in all the apostles together, that, out of the Jews … this great number believed, were baptized in the name of Christ and continued steadfast in the apostles’ doctrine and in the prayers. - "Catechetical Lectures 17.21"
Thou, female. How beautiful are the feet of those who announce good tidings! (Romans x. 15.) (Haydock)
Thus a feminine noun is applied to Solomon, Ecclesiastes i. Prophets make known to all the coming of the Saviour. (Calmet)
Christ preaches from the mountain, and his apostles over the world. (Worthington)
The high mountain is the summit of doctrine and practice. Let one rise up who hurries to anoint the king. Let him reach into the heights. Let him rise up in lofty practice, in lofty contemplation, in the wisdom of the Word, in the power of love. He who is the One anointed by preaching is so great that he can be scarcely reached, even by the highest places.… The highest heights are the power of perfect conversation, and this is achieved by many perfectly. - "Six Books on 1 Kings 6.114"