“Fame is a vapor, popularity is an accident, riches take wings, those who cheer today may curse tomorrow and only one thing endures - character.”

“And so to those of you who may be vitalists I would make this prophecy: what everyone believed yesterday, and you believe today, only cranks will believe tomorrow.”

“The power to do good is also the power to do harm; those who control the power today may not tomorrow; and, more important, what one man regards as good, another may regard as harm.”

“Nostalgia is an illness
for those who haven't realized
that today
is tomorrow's nostalgia.”

“May those men who are animated by the true scientific spirit cease to believe that they are obliged to consider only subjects of public utility; …because, one must not hide it, the field of applications, so rich and fertile today, would not take long to be blighted by sterility if it ceased to be fertilized and revivified by the beneficial light which theoretical research radiates and pours incessantly upon it.”

“Things may come to those who wait, but only the things left by those who hustle.”

“There's only one day at a time here, then it's tonight and then tomorrow will be today again.”

“Today is gone. Today was fun.
Tomorrow is another one.
Every day,
from here to there,
funny things are everywhere.”

“Today's today. Tomorrow we may be
ourselves gone down the drain of Eternity.”

“Cherish what you have now and tame your sensual desires. Tomorrow belongs to those who cherish today.”