In the Holy Qur'an

Say: Are those who know equal to those who do not know? Only those who possess intellect take admonition (39:9)

In the Traditions

The Prophet said, "The quest for knowledge is incumbent upon every Muslim, by virtue of it the Lord is obeyed and worshipped, consanguinal relations are maintained, and the lawful is distinguished from the prohibited.
Knowledge leads to action and action follows it. The fortunate ones are inspired by it whereas the wretched ones are deprived of it."

Imam Ali said, "Knowledge is better than wealth, for knowledge guards you while you guard wealth, and wealth is reduced by spending, whereas knowledge increases by spending it, and any good produced by wealth (respect and honour) ceases when it ceases to exist."

Imam Ali said, "The scholar is alive even when he is dead, whereas the ignorant man is dead even though he may be alive."

The Prophet said, "An hour spent by a knowledgeable man lying on his bed thinking about his deeds is better than seventy years spent by the worshiper performing acts of worship."