A question with no answer is a barrier that cannot be breached. In other words, it is questions with no answers that set the limits of human possibil… - Milan Kundera

The novel is not the author's confession; it is an investigation of human life in the trap the world has become

In the world of eternal return the weight of unbearable responsibility lies heavy on every move we make. That is why Nietzsche called the idea of eternal return the heaviest of burdens.
If eternal return is the heaviest of burdens, then our lives can stand out against it in all their splendid lightness.
But is heaviness truly deplorable and lightness splendid?
The heaviest of burdens crushes us, we sink beneath it, it pins us to the ground. But in the love poetry of every age, the woman longs to be weighed down by the man's body. The heaviest of burdens is therefore simultaneously an image of life's most intense fulfillment. The heavier the burden, the more real and truthful they become.
Conversely, the absolute absence of a burden causes man to be lighter than air, to soar into the heights, take leave of the earth and his earthly being, and become only half real, his movements as free as they are insignificant.
What then shall we choose? Weight or lightness?
...That is the question. The only certainty is: the lightness/weight opposition is the most mysterious, most ambiguous of all.

Dreaming is not only an act of communication; it is also an aesthetic activity, a game of the imagination, a game that is a value in itself. Our dreams prove that to imagine - to dream about things that have not happened - is among mankind’s deepest needs. Herein lies the danger. If dreams were beautiful, they would quickly be forgotten.