What is the key to knowledge in the gospels
Jesus in the gospels meets the doctors of the Law and tells them: Woe to you experts in the Law, because you have taken away the key to knowledge. You yourselves have not entered, and you have hindered those who where entering", Luke 11:52.
To understand what it is the key to knowledge, it is necessary to understand what it is a doctor of the Law. The medicine is a science, there is the one that is ignorant of medicine, the one who opines about medicine and the one who knows about medicine. What is the name of the one who knows about medicine? Doctor in medicine. A doctor of the Law is a person trained to teach the commandments of God, that is to say a doctor of the Law is a religious figure formed in the books of the Old Testament, like Nicodemus.
We say that wisdom and philosophy are sciences, wisdom is the science of the ultimate and the first causes, the science of the truth and the substance. What is the name of the one who knows about philosophy and wisdom? Doctor of philosophy and doctor of wisdom respectively, but here is a detail, a doctor of philosophy is a person who made five years of a career in the university and did a doctorate. Instead a doctor of wisdom is a person trained by God to give "learn", "knowledge" of the divine science (wisdom) through listening (gift of consel), in the Christian faith this is known as being fullfilled with the holy spirit, In the Christian faith we are doctors of wisdom in the sacrament of confirmation.
Jesus resolves as a doctor of wisdom in several cases in the Bible by resolving with the Gift of Counsel:"Give to Caesar what is Caesar's, and to God what is God's", Matthew 22:21; also:"Let him who is without sin among you be the first to cast a stone at her", John 8:7.
Jesus as a Doctor of wisdom confronts the Doctors of the Law and denounces them for preventing people from entering to the Kingdom of God. The Kingdom of God is the empire, kingdom, government of the divine perfections (spiritual gifts): empire of godliness, kingdom of mercy, government of perseverance. To enter the Kingdom of God, that is, to enter in the culture of excellence (the spiritual gifts are excellencies and perfections) we need the "key", that is, the wisdom. The wisdom is the knowledge of the correct means to live, and to live the spiriutal gifts is to seek the correct and the best, the correct for the gift of counsel and the best for the mercy. We need the key to knowledge to enter to the Kingdom of God.
The Doctors of the Law of Moses, Jesus denounces, oppress the people by plunging them into ignorance and error (heresy), by reducing spirituality to the simple practice of the commandments. The commandments do not obligate us to help our neighbor. We need the science of wisdom (key to knowledge) to live in communion with God and our neighbor. You can comply with all the Law of Moses and sin, passing away from our neighbor, as in the Parable of the Good Samaritan.