Alas! mine is the bitter grief that I enter it, a man "vanquished by time," deprived of my
masters, even of my companions in the struggle, Dumas, Bouley, Paul Bert, and lastly
Vulpian, who, after having been with you, my dear Grancher, my counselor at the very
first, became the most energetic, the most convinced champion of this method.
However, if I have the sorrow of thinking that they are no more, after having valiantly
taken their part in discussions which I have never provoked but I have had to endure; if
they cannot hear me proclaim all that I owe to their counsels and support; if I feel their
absence as deeply as on the morrow of their death, I have at least the consolation of
believing that all we struggled for together will not perish. The collaborators and
students who are now here share our scientific faith.... Keep your early enthusiasm,
dear collaborators, but let it ever be regulated by rigorous examinations and tests.
Never advance anything that cannot be proved in a simple and decisive fashion.
Worship the spirit of criticism. If reduced to itself, it is not an awakener of ideas or a
stimulant to great things, but, without it, everything is fallible; it always has the last word.
What I am now asking you, and you will ask of your pupils later on, is what is most
difficult to an inventor.
It is indeed a hard task, when you believe you have found an important scientific fact

Find passive voice in the writing