Why Were the Quranic Verses Not Revealed at Once, But Revealed in Stages?

Why wasn't the Quran sent down at once as a complete book, but was sent down gradually over time?

Answer:

Allah (swt) revealed the verses of the Quran gradually in proportion to the events and the people’s benefits, needs and the situations.
For instance, alcoholic beverages were forbidden in four stages. Because alcohol took a very important place in the social life of the society in which Quran was first revealed. By the gradual prohibition, it became easier for people to adopt the change and give up their life style; their bad habits and addictions to which they were strongly stick with their customs for long years, perhaps for centuries.
Another wisdom of the gradual revelation was to place the verses in the Blessed Prophet Muhammad’s (pbuh) memory in the best and strongest way, so that He would transmit the verses to the people the most authentically and correctly; as He always did.
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