A great Rabbi, Hillel, taught that on the first night of Chanukah we light one candle and each successive night we add an additional candle until on the eighth night there are eight candles.
Why did Hillel prescribe this method for commemorating the eight days of Chanukah? Wouldn't it have been more impressive to light eight candles each night?
There are two important lessons for us to learn:
(1) We must always strive to grow and increase our spirituality. One never stays in the same place
-you either improve or you fall behind.
(2) It is a mistake to grasp too much too fast. Growing spiritually is like climbing a ladder. If you try to climb too many rungs in one step, you're likely to fall.
That is why we increase the Chanukah lights one candle at a time!
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Shmiras Einayim also takes steps, one rung at a time, a person can rebuild their sensitivity to the difference between kosher and non-kosher sights. As time goes on, we will regain the purity that Hashem intended us to have. As long as we strive to grow, Hashem will help and we should all merit to reach our greatest potential.