I found this at 20000-names

``In Freemasonry, the Acacia symbolizes immortality of the soul, innocence and purity, and birth into a new life. The acaica seyal is believed to have been the biblical shittah-tree (Isaiah 41:19) which furnished the wood for the Ark of the Covenant and for the Tabernacle.``

...birth into a new life...couldn't have said it better myself