Charles H. Spurgeon on Psalms 50:2

Out of Zion, the perfection of beauty, God hath shined. The Lord is represented not only as speaking to the earth, but as coming forth to reveal the glory of his presence to an assembled universe. God of old dwelt in Zion among his chosen people, but here the beams of his splendour are described as shining forth upon all nations. The sun was spoken of in the first verse, but here is a far brighter sun. The majesty of God is most conspicuous among his own elect, but is not confined to them; the church is not a dark lantern, but a candlestick. God shines not only in Zion, but out of her. She is made perfect in beauty by his indwelling, and that beauty is seen by all observers when the Lord shines forth from her. Observe how with trumpet voice and flaming ensign the infinite Jehovah summons the heavens and the earth to hearken to his word.