This quote comes from the 1850 diary of a student at Emory and Henry College in Virginia. Andrew Delbanco writes about in his 2013 book College: What It Was, Is, and Should Be. I highly recommend this book.
A few years ago, I came across a manuscript diary…from 1850–kept by a student at a small Methodist college, Emory and Henry, in southwest Virginia. One spring evening, after attending a sermon by the college president that left him troubled and apprehensive, he made the following entry in his journal: “Oh that the Lord would show me how to think and how to choose.” That sentence, poised somewhere between a wish and a plea, sounds archaic today. For many if not most students, God is no longer the object of the plea; or if he is, they probably do not attend a college where everyone worships the same god in the same way. Many American colleges began as denominational institutions; but today religion is so much a matter of private conscience, and the number of punishable infractions so small (even rules against the academic sin of plagiarism are only loosely enforced), that few college presidents would presume to intervene in the private lives of students for the purposes of doctrinal or moral correction. The era of spiritual authority belonging to college is long gone. And yet I have never encountered a better formulation–“show me how to think and how to choose”–of what a college should strive to be: an aid to reflection, a place and process whereby young people take stock of their talents and passions and begin to sort out their lives in a way that is true to themselves and responsible to others (pp.16-17).