1.
What good your beautiful proof on the transcendence of Pi: Why investigate such problems, given that irrational numbers do not even exist?
Leopold Kronecker
2.
The soul may not be destroyed. The soul goes on forever. Like the number pi, it is without cessation or conclusion. Like pi it is a constant. Pi is an irrational number, incapable of being made into a fraction, impossible to divide from itself. So, too, the soul is an irrational, indivisible equation that perfectly expresses one thing: you.
Joe Hill
3.
The transfinite numbers are in a sense the new irrationalities [ ... they] stand or fall with the finite irrational numbers.
Georg Cantor
4.
I chose the name Pi because it's an irrational number (one with no discernable pattern). Yet scientists use this irrational number to come to a "rational" understanding of the universe. To me, religion is a bit like that, "irrational" yet with it we come together we come to a sound understanding of the universe.
Yann Martel
5.
God has given us the fascination and mystery of irrational numbers, as one aspect of a rich world
Vern Poythress
6.
And then there is Pythagoras. The legend is that the founder of theoretical mathematics was so outraged when one of his students, the haplessly gifted Hippasus, discovered irrational numbers that he sent the poor fellow out on a raft to drown, initiating a venerable tradition of professors mistreating their graduate students.
Rebecca Goldstein