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Miracles are signs not to them that believe, but to them that believe not.
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If forgers and malefactors are put to death by the secular power, there is much more reason for excommunicating and even putting to death one convicted of heresy.
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The Blessed Eucharist is the perfect Sacrament of the Lord's Passion, since It contains Christ Himself and his Passion.
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It is possible to demonstrate God's existence, although not a priori, yet a posteriori from some work of His more surely known to us.
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He who is dying of hunger must be fed rather than taught.
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Man is closer to God according to his existence in grace than he is according to his existence in nature.
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Humility is the mark of a genuine disciple.
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It is unlawful to add anything to the words of Holy Scripture regarding the sense.
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What can be accomplished by a few principles is not effected by many. But it seems that everything we see in the world can be accounted for by other principles, supposing God did not exist. For all natural things can be reduced to one principle, which is nature, and all voluntary things can be reduced to one principle, which is human reason, or will. Therefore there is no need to suppose God's existence.
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Clearly the person who accepts the Church as an infallible guide will believe whatever the Church teaches.
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The highest perfection of human life consists in the mind of man being detached from care, for the sake of God.
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A man has free choice to the extent that he is rational.
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Sacred Scripture, since it has no science above itself, can dispute with one who denies its principles only if the opponent admits some at least of the truths obtained through divine revelation; thus we can argue with heretics from texts in Holy Writ, and against those who deny one article of faith we can argue from another. If our opponent believes nothing of divine revelation, there is no longer any means of proving the articles of faith by reasoning, but only of answering his objections - if he has any - against faith.
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By the divine providence animals are intended for man's use... Hence it is not wrong for man to make use of them, either by killing or in any other way whatsoever.
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Better to illuminate than merely to shine; to deliver to others contemplated truths than merely to contemplate.
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Since faith rests upon infallible truth, and since the contrary of a truth can never be demonstrated, it is clear that the arguments brought against faith cannot be demonstrations, but are difficulties that can be answered.
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Charity, by which God and neighbor are loved, is the most perfect friendship.
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There is nothing on this earth more to be prized than true friendship.
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Eternity is called whole, not because it has parts, but because it is lacking in nothing.
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The same fire" (which he decides to be material) " torments the damned in hell and the just in purgatory...The least pain in purgatory exceeds the greatest in this life.
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A man's heart is right when he wills what God wills.
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An angel can illumine the thought and mind of man by strengthening the power of vision and by bringing within his reach some truth which the angel himself contemplates.
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Baptism is the door of the spiritual life and the gateway to the sacraments.
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We are like children, who stand in need of masters to enlighten us and direct us; God has provided for this, by appointing his angels to be our teachers and guides.