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Aquinas's
Summa Theologica

According to Aristotle, it belongs to wisdom (philosophy) to consider the highest cause. By means of that cause we are able to form a most certain judgment about other causes, and according thereto all things should be set in order. See full passage

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Berkeley's
Treatise on Knowledge

Philosophy being nothing else but the study of Wisdom and Truth, it may with reason be expected, that those who have spent most Time and Pains in it should enjoy a greater calm and serenity of Mind, a greater clearness and evidence of Knowledge, and be less disturbed with Doubts and Difficulties than other Men. See full passage

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Hegel's
History of Philosophy

The ultimate aim and business of philosophy is to reconcile thought or the Notion with reality. See full passage

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Nietzsche's
Ecco Homo

Philosophy, as I have understood it hitherto, is a voluntary retirement into regions of ice and mountain-peaks—the seeking—out of everything strange and questionable in existence, everything upon which, hitherto, morality has set its ban. See full passage

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