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For it is necessary in every practical science to proceed in a composite (i.e. deductive) manner. On the contrary in speculative science, it is necessary to proceed in an analytical manner by breaking down the complex into elementary principles.
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Those who are more adapted to the active life can prepare themselves for contemplation in the practice of the active life, while those who are more adapted to the contemplative life can take upon themselves the works of the active life so as to become yet.
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We should love others truly, for their own sakes rather than our own.
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Better to illuminate than merely to shine.
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Any error about creation also leads to an error about God.
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To be united to God in unity of person was not fitting to human flesh, according to its natural endowments, since it was above his dignity; nevertheless, it was fitting that God, by reason of his infinite goodness, should unite it to himself for human salvation.
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No man truly has joy unless he lives in love.
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It may well happen that what is in itself the more certain on account of the weakness of our intelligence, which is dazzled by the clearest objects of nature; as the owl is dazzled by the light of the sun. Hence the fact that some happen to doubt about articles of faith is not due to the uncertain nature of the truths, but to the weakness of human intelligence; yet the slenderest knowledge that may be obtained of the highest things is more desirable than the most certain knowledge obtained of lesser things.
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Faith does not quench desire, but inflames it.
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The light of faith makes us see what we believe.
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The soul is perfected by knowledge and virtue.
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It is not possible to be ignorant of the end of things if we know their beginning.
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Far graver is it to corrupt the faith that is the life of the soul than to counterfeit the money that sustains temporal life.
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The soul is known by it's acts.
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In order for a war to be just, three things are necessary. First, the authority of the sovereign... Secondly, a just cause... Thirdly... a rightful intention.
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It seems that God does not exist; because if one of two contraries be infinite, the other would be altogether destroyed. But the word "God" means that He is infinite goodness. If, therefore, God existed, there would be no evil discoverable; but there is evil in the world. Therefore God does not exist.
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To restore man, who had been laid low by sin, to the heights of divine glory, the Word of the eternal Father, though containing all things within His immensity, willed to become small. This He did not by putting aside His greatness but by taking to Himself our littleness.
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Give, expecting nothing there of.
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The happy man in this life needs friends.
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The last end of every maker, as such, is himself, for what we make we use for our own sake; and if at any time a man make a thing for the sake of something else, it is referred to his own good, whether his use, his pleasure, or his virtue.
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Just as in a physical body the operation of one member contributes to the good of the whole body, so it is in a spiritual body such as the Church. And since all the faithful are one body, the good of one member is communicated to another; everyone members, as the Apostle says, of one another. For that reason, among the points of faith handed down by the Apostles, is that there is a community of goods in the Church, and this is expressed in the words Communion of Saints.
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Grace renders us like God and a partaker of the divine nature.
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In the realm of evil thoughts none induces to sin as much as do thoughts that concern the pleasure of the flesh.
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The servants of God...whether provoked by word or work, by keeping themselves tranquil and peaceful, evince a perfect nobleness of soul.