On the Importance of Right Faith

St. Ambrose of Optina 1812-1891
[H]e who possesses an incorrect, contradictory and false understanding of the Faith and Christian Truth has difficulty finding salvation, even when he wants it.  Even more difficult is it for him to possess a Christian spirit and the spirit of Christ.
You write that your brother graduated from a Petersburg university.  If someone were to tell your brother that in order to obtain a good position as a district attorney or even a judge one does not need any high school or university education, but only love for his fellow man, would he believe it? It is just as impossible for a man who does not have a correct and true knowledge of the dogmas of the Christian Faith to possess a Christian spirit. (Source)