Commentary Purg XXIX 43-45

Like Matelda, who also seemed other than what she finally comes to mean to the protagonist, the seven candlesticks (verse 50) are perceived first and erroneously by him as seven trees.  Carroll (DDP Carroll.Purg.XXIX.64-150) comments upon them as follows: 'They represent the seven 'gifts of the Spirit,' as named in the Vulgate of Isaiah 11:2-3, namely, Wisdom, Intellect, Counsel, Fortitude, Knowledge, Piety, and Fear of the Lord.'  Dante discusses them in Conv.IV.xxi.11-12.