The following quote is an answer to those who promote - Sola Scriptura (Scripture alone), and in believing this, when our natural ability to reason, and the voice of our conscience and our rational understandings conflict with what we read in the Word, that we need not suspect what we have read in the Word, or that it needs to be studied further and reconciled to the inward voices of our human nature.  

  "I am aware that those who have spoken most contemptuously of human reason have acted from a good motive -- their aim has been to exalt revelation from the Bible. They have thought that by magnifying this as the only means of divine teaching, they were adding to its dignity. But truth gains nothing by exaggeration; and Christianity, as we have seen, is undermined by nothing more effectually than by the misunderstanding which would bring discredit on our rational powers. Revelation needs no such support. For myself, I do not find that to esteem Christianity, I must think it the only source of instruction to which I must repair. I need not make human nature dumb to give power or attraction to the teaching of Christ. 

Christ derives new interest and confirmation from its harmony with our human nature. Christianity would furnish a weapon against itself not easily repelled, should it claim the distinction of being the only light vouchsafed by God for men; for, in that case, it would represent a vast majority of the human race as left by their Creator without guidance or hope. I believe, and rejoice to believe, that a ray from heaven descends on the path of every fellow-creature. The heathen, though in darkness when compared with the Christian has still his light; and it comes from the same sources as our own, just as the same sun dispensed, now the faint dawn, and now the perfect day. Let not nature's teachings be disparage. It is from God as truly as His word. It is sacred, as truly as revelation. Both are manifestations of one infinite mind, and harmonious manifestations; and without this agreement the claims of Christianity could not be sustained." W. E. Channing.