Dante's Inferno is that human beings are subject to temptation and commit sins, leaving no escape from the eternal punishments of hell. However, human beings have free will, and they can make choices to avoid temptation and sin, ultimately earning the eternal rewards of heaven
The abiding moral lesson of the Inferno is that evil is always punished. Throughout his journey into hell, Dante the pilgrim comes across numerous people who, when they were alive, were rich and powerful. Many of them probably thought that they could act as they pleased without fear of any consequences.
