Vitruvius described the human figure as being like the principal source of proportion among the Classical orders of architecture.Some of the first humanists were great collectors of antique manuscripts, including Petrarch, Giovanni Boccaccio, Coluccio Salutati, and Poggio Bracciolini.
Charles Trinkhaus regards Valla's "epicureanism" as a ploy, not seriously meant by Valla, but designed to refute Stoicism, which he regarded together with epicureanism as equally inferior to Christianity.
If people who live agreeably are Epicureans, none are more truly Epicurean than the righteous and godly.
And if it is names that bother us, no one better deserves the name of Epicurean than the revered founder and head of the Christian philosophy Christ, for in Greek epikouros means "helper." He alone, when the law of Nature was all but blotted out by sins, when the law of Moses incited to lists rather than cured them, when Satan ruled in the world unchallenged, brought timely aid to perishing humanity.
Completely mistaken, therefore, are those who talk in their foolish fashion about Christ's having been sad and gloomy in character and calling upon us to follow a dismal mode of life.
The rediscovery of classical philosophy and science would eventually challenge traditional religious beliefs.
In 1417, for example, Poggio Bracciolini discovered the manuscript of Lucretius, De rerum natura, which had been lost for centuries and which contained an explanation of Epicurean doctrine, though at the time this was not commented on much by Renaissance scholars, who confined themselves to remarks about Lucretius's grammar and syntax.
Renaissance Neo-Platonists such as Marsilio Ficino (whose translations of Plato's works into Latin were still used into the 19th century) attempted to reconcile Platonism with Christianity, according to the suggestions of early Church Fathers Lactantius and Saint Augustine.
In this spirit, Pico della Mirandola attempted to construct a syncretism of all religions (he was not a humanist but an Aristotelian trained in Paris), but his work did not win favor with the church authorities.
Many humanists were churchmen, most notably Pope Pius II, Sixtus IV, and Leo X, Much humanist effort went into improving the understanding and translations of Biblical and early Christian texts, both before and after the Reformation, which was greatly influenced by the work of non-Italian, Northern European figures such as Erasmus, Jacques Lefèvre d'Étaples, William Grocyn, and Swedish Catholic Archbishop in exile Olaus Magnus.
The Cambridge Dictionary of Philosophy describes the rationalism of ancient writings as having tremendous impact on Renaissance scholars: Here, one felt no weight of the supernatural pressing on the human mind, demanding homage and allegiance.