"Certainty is the mark of the commonsense life: gracious uncertainty is the mark of the spiritual life. To be certain of God means that we are uncertain in all our ways, we do not know what a day may bring forth. This is generally said with a sigh of sadness, it should be rather an expression of breathless expectation. We are uncertain of the next step, but we are certain of God."
— Oswald Chambers
Source: My Utmost for His Highest, April 29, "The Graciousness of Uncertainty"