`Abdu'-Bahá - `Abdu'l-Bahá in London стр 5.

Moses came during a time of darkness, when ignorance and childishness prevailed amongst the people, and they were waverers. Moses was the teacher of God; He gave the teachings of holiness and educated the Israelites. He raised up the people from their degradation and caused them to be highly honoured. He taught them Sciences and Arts, trained them in civilization and increased their human virtues. After a while, that which they had thus received from God was lost; the way was prepared for the return of evil qualities, and the world was oppressed by tyranny.