Instrumental or mechanical science is the noblest and, above all others, the most useful. - Leonardo da Vinci

Although attempting to bridge the gulf which separated the real from the unreal, he refused to treat the latter supernaturally. That mystery which lesser minds found in the occult, he saw in nature all about him. He denied the existence of spirits, just as he urged the foolishness of the will-o'-the-wisps of former ages, — alchemy and the black art.

To lie is so vile, that even if it were in speaking well of godly things it would take off something from God's grace; and Truth is so excellent, that if it praises but small things they become noble.

Fame alone raises herself to Heaven, because virtuous things are in favour with God.