"Above all, we must be accurate, and it is an obligation which we intend to fulfill scrupulously."

"You are invited to come to see the Earth turn, tomorrow, from three to five, at Meridian Hall of the Paris Observatory."

"The phenomenon develops calmly, but it is invisible, unstoppable. One feels, one sees it born and grow steadily; and …"

"May those men who are animated by the true scientific spirit cease to believe that they are obliged to consider only …"

"At the age of 25, not having learnt anything at school nor from book, enthusiastic about science but not about study,…"

"Let Man remember that he is the Master, but not a Tyrant."

"The Saviour arose into heaven through His own power as Lord and Creator...Mary arose into heaven lifted up by grace, …"

"How is it possible we should taste true joy for one moment, in this life, in which we are beset with miseries, and si…"

"There will be sacrifices in thus referring everything to God; there are sacrifices, and there will be always. But wha…"

"I desire, if by any possibility I should become a priest, to be a missionary, and if I am a missionary to be a martyr."