if there is no personal God, then the concept of beauty dissolves into personal idiosyncrasy. That is, unless beauty is rooted in God's mind rather than your mind, every time you say, 'That is beautiful,' all you really mean is, 'I like that.' Unless there is a God, your praise of beauty can be no more than expressions of your own personal preferences. But I think there is in every one of you a dissatisfaction with the notion that your judgments about beauty have no more validity than your preference for coffee over tea. And I think your dissatisfaction with pure subjectivism and relativism is a remnant of God's image in your soul and evidence of his reality. It is an echo, however faint, of a voice that once called you into being.
John Piper