Roman military commander and writer (AD23/24–79)
Gaius Plinius Secundus (23 – 79), called Pliny the Elder was a Roman author, naturalist, natural philosopher, naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic Naturalis Historia (Natural History), which became an editorial model for encyclopedias.
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The only certainty is that nothing is certain. (Fuller version: This series of instances entangles unforeseeing mortality, so that among these things but one thing is in the least certain—that nothing certain exists, and that nothing is more pitiable, or more presnmptuous, than man! In Latin: Quae singula inprovidam mortalitatem involvunt, solum ut inter ista vel certu(m) sit nihil esse certi nec quicquam miserius homine aut superbius. Some sources have "certu", others "certum".)
The world, and whatever that be which we call the heavens, by the vault of which all things are enclosed, we must conceive to be a deity, to be eternal, without bounds, neither created nor subject at any time to destruction. To inquire what is beyond it is no concern of man; nor can the human mind form any conjecture concerning it.