2 Corinthians 1:12 (ESV) For our boast is this, the testimony of our conscience, that we behaved in the world with simplicity and godly sincerity, not by earthly wisdom but by the grace of God, and supremely so toward you.
If you are absolutely obedient to God, then there is no ambiguity in you and... you are mere simplicity before God.... One thing there is which all Satan's cunning and all the snares of temptation cannot take by surprise. That is simplicity. -- Søren Kierkegaard (1813-1855)
Edythe Draper, Draper's Book of Quotations for the Christian World, (Wheaton, IL: Tyndale House Publishers, 1992), WORDsearch CROSS e-book, Under: "Simplicity".