In the second place, grace is _assistance_: it enlightens the intellect that it may be able to see more clearly, not giving to motives of faith an importance which they have not of themselves, but helping the intellect to see them as they are; removing the troubles and dangers of doubt which beset the mind, so that it may retain that calmness which generally accompanies the possession of the truth. The pledge of this assistance is given the Christian at baptism and with each increase of sanctifying grace. But the actual effect of grace depends on many conditions. If one omits prayer and neglects religious duties, deafens one’s ear to the word of God, incurs knowingly unnecessary dangers to faith, forsakes the path of virtue, then grace may withdraw to a considerable extent; doubts become stronger, intellectual darkness and confusion increase, and man goes on apace towards infidelity. This is the Catholic doctrine concerning faith. Faith and Reason. But to return to our question: In what relation do faith and the duty to believe stand to freedom of research? We said that freedom of research consists in exemption from all unjust external restraint, that is, from those external hindrances to the action of the human intellect which prevent it from attaining its natural end. Now what is this natural end? The answer will make clear what restraint and laws must be respected by the human mind, and which may be rightly rejected.