Charles Spurgeon Commentary Acts 7:26-30

"And the day following he appeared unto them as they strove, and would have set them at one again, saying, Sirs, ye are brethren; why do ye wrong one to another? But he that did his neighbor wrong thrust him away, saying, Who made thee a ruler and a judge over us? Wouldest thou kill me, as thou killedst the Egyptian yesterday? And Moses fled at this saying, and became a sojourner in the land of Midian, where he begat two sons. And when forty years were fulfilled, an angel appeared to him in the wilderness of Mount Sinai, in a flame of fire in a bush." — Acts 7:26-30 (ASV)

So that he was eighty years of age when he really began his great lifework. Perhaps, as a rule, the larger part of our time is occupied in getting ready to work. Yet, if we are able to perform a work as good as that which Moses did, it will repay us well for a long period of preparation.