I actually hav a few interpretations of this poem. But I'll just state only one below :
I think the first 2 stanzas symbolises life in the eyes of the living.
'Things of happiness', memories of the sadness' are all agents/obstacles the living must undergo in life. The life of man-kind brings about pain and suffering yet is able to yield a lifetime of 'happiness'.
It then goes on to elaborate on the 'memories' of life and once again self-battles human's suffer to fight against everyday - guilt, vengeance, 'remorse', fear of death etc.
The 3rd stanza sparks rejection of religion.The use of the word
'future' in death suggests the belief of life after death.(re-incarnation, heavon)
'Unheavonly' in other words - ungodly or not related to the divine being(god). So by declining the fall of angels/or declining the existance of GOD that person is rejecting the theory of re-incarnation, heavon or life after death.
The finishing statement as interpreted by me talks about the comfort and reassurance religion has upon life and death. So by rejecting religion ur withdrawing the idea of reincarnation, heavon. etc. Thus a persons joy will somewhat be revoked having removed that comfort in life and promise of eternal bliss in death.
There, my interpretation of Jaders poem. This is how I feel about life itself which is probably why I interpreted it in such a way. I'm really tired so I hope my interpretation was understandable.
i higly doubt this is correct but it was challenging and enjoyable, nonetheless. lol. ^_^