A student of Theology should use the knowledge of several philosophies. He prepares himself to know the Truth, or Theology, by reflecting on philosophies, by reasoning, by discrepancy, and by inter-relating his theses.
Natural reason can investigate a little by itself about Divine Mysteries.
A man knows God in a nominal way, but his reason, through constant and fervent desire of investigating the nature of God, may have a confuse knowledge in its magnetic mental field.