Infinity is a floorless room without walls or ceiling. – Author Unknown

Nature does not count nor do integers occur in nature. Man made them all, integers and all the rest, Kronecker to the contrary notwithstanding. – Percy William Bridgman, The Way Things Are

Let us grant that the pursuit of mathematics is a divine madness of the human spirit, a refuge from the goading urgency of contingent happenings. – Alfred North Whitehead