At the end of a life spent in the pursuit of knowledge Faust has to confess: "I now see that we can nothing know." That is the answer to a sum, it is the outcome of a long experience. But as Kierkegaard observed, it is quite a different thing when a freshman comes up to the university and uses the same sentiment to justify his indolence. As the answer to a sum it is perfectly true, but as the initial data it is a piece of self-deception.
In his heart every man knows quite well that, being unique, he will be in the world only once and that no imaginable chance will for a second time gather together into a unity so strangely variegated an assortment as he is: he knows it but he hides it like a bad conscience—why? From fear of his neighbor, who demands conventionality and cloaks himself with it. But what is it that constrains the individual to fear his neighbor, to think and act like a member of a herd, and to have no joy in himself? Modesty, perhaps, in a few rare cases. With the great majority it is indolence, inertia. ... Men are even lazier than they are timid, and fear most of all the inconveniences with which unconditional honesty and nakedness would burden them. Artists alone hate this sluggish promenading in borrowed fashions and appropriated opinions and they reveal everyone’s secret bad conscience, the law that every man is a unique miracle.
Friedrich Nietzsche, Untimely Meditations, “Schopenhauer as educator,” § 3.1, R. Hollingdale, trans. (1983), p. 127