(Note: the reference is to church windows; this poem is part of Herbert's long sequence The Church, which in turn is part of The Temple, which contains most of his English poetry.)

THE WINDOWS

LORD, how can man preach thy eternall word ? 
        He is a brittle crazie glasse : 
Yet in thy temple thou dost him afford 
        This glorious and transcendent place, 
        To be a window, through thy grace. 

But when thou dost anneal in glasse thy storie, 
        Making thy life to shine within 
The holy Preachers, then the light and glorie 
        More rev'rend grows, and more doth win; 
        Which else shows watrish, bleak, and thin. 

Doctrine and life, colours and light, in one 
        When they combine and mingle, bring 
A strong regard and aw:  but speech alone 
        Doth vanish like a flaring thing, 
        And in the eare, not conscience ring. 

*

This poem seems relevant to much that is happening in the Church today. I got the text from the excellent Luminarium, which is a repository of a huge amount of English literature. The link is to the editor's account of how and why she began and continues the site.

Herbert's parish church:

(By Busterweb at English Wikipedia, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=52490091)

Interior views of the church, and a good deal of information about Herbert, here.