For Satan does not tempt unbelievers and sinners whom he already holds securely, but in many ways he does tempt and trouble the faithful servant. Go forward, then, with sincere and unflinching faith, and with humble reverence approach this Sacrament. Whatever you cannot understand commit to the security of the all-powerful God, Who does not deceive you. The man, however, who trusts in himself is deceived. God walks with sincere men, reveals Himself to humble men, enlightens the understanding of pure minds, and hides His grace from the curious and the proud.
Human reason is weak and can be deceived.
True faith, however, cannot be deceived. All reason and natural science ought to come after faith, not go before it, nor oppose it. For in this most holy and supremely excellent Sacrament, faith and love take precedence and work in a hidden manner. 257 God, eternal, incomprehensible, and infinitely powerful, does great and inscrutable things in heaven and on earth, and there is no searching into His marvelous works. If all the works of God were such that human reason could easily grasp them, they would not be called wonderful or beyond the power of words to tell.