We saw how the latter pictured the event as actually taking place outside Jerusalem.
To Botticelli the Nativity of Christ was emblematic of a new and happier life for people in Florence, with the Church regenerated and purified, as Christ would have wished it to be.

To him the Nativity was a symbol of purity, so he painted the picture as a commentary on the event, not as an illustration of the Biblical text.
The angels rejoice in heaven as the shepherds upon earth, the devils flee away discomfited, and Savonarola and his companions obtain peace after the tribulations of life.

Such was the message of Botticelli in the picture here reproduced..