The expanding appreciation of truth

The following is from 'Faith and Practice of New England Yearly Meeting of Friends' (1950, p. v.), which I was reading earlier, this morning.

Truth is unchanging and eternal; the revelation and understanding of truth are unfolding processes of growth, extending over the lives of individuals and spanning the long ages in the development of humankind. These basic principles apply to human institutions, both secular and religious. Expressions of truth, whether in words or in deeds, should change in keeping with the growth of revelation and of human understanding…

Frequently, human beings see as “through a glass darkly.” Therefore, it is necessary to strive constantly for a clearer comprehension of divine truth. “A religion based on truth must be progressive. Truth being so much greater than our conception of it, we should ever be making fresh discoveries.”