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. Immediately we abandon to God, and do the duty that lies nearest, He packs our life with surprises all the time. Jesus said, Except ye . . . become as little children.
Spiritual life is the life of a child.
We are not uncertain of God, but uncertain of what He is going to do next. Oswald Chambers, My utmost for his highest.