For [Bonhoeffer], philosophy was man’s search for truth apart from God. It was a type of Barth’s “religion,” in which man himself tried to reach heaven or truth or God. But theology begins and ends with faith in Christ, who reveals himself to man; apart from such revelation, there could be no such thing as truth. Thus the philosopher - and the theologian who operates on a philosopher’s assumptions - chases his own tail and gazes at his own navel. He cannot break out of that cycle, but God, via revelation, can break in.
Eric Metaxas, Bonhoeffer - Pastor, Martyr, Prophet, Spy
11 For the grace of God has appeared that offers salvation to all people. 12 It teaches us to say “No” to ungodliness and worldly passions, and to live self-controlled, upright and godly lives in this present age, 13 while we wait for the blessed hope—the appearing of the glory of our great God and Savior, Jesus Christ, 14 who gave himself for us to redeem us from all wickedness and to purify for himself a people that are his very own, eager to do what is good.
If a person wants scientific knowledge, then intellectual curiosity must be his guide. But if he desires knowledge and insight into the teachings of Jesus Christ, he can only obtain it through obedience.
Oswald Chambers, My Utmost for His Highest