That sentence is the whole argument, not a decoration. Strange means a life that does not look like anyone else's. Sublime is the older sense of the word: awe, scale, something that lifts you even while it unsettles you. The ten months of unnatural living are the evidence offered against Ecclesiastes. Not everything under the sun is vanity if the odd path still has grandeur. So the destiny is not excused for being strange. It is claimed as magnificent anyway.