Universal Goodness : 43
A prison may or may not contain walls. But for all human beings, the world we live in is actually a prison. The reason is that our world is part of the round of rebirth from which no one can escape. All of us are prisoners of the round of rebirth.
In the Khuddakanikaya Dhammapada, the Lord Buddha says:
"Come and take a look at this world which is as magnificent as a royal carriage that fools take delight in, but the wise persons do not."