One dies and one to gain

As one dies another is gained
a reason why, not a reason explained

for one door to open one shall close
the deceased life gives one to propose

as the proposed life takes its course
this new life will feel melancholy and remorse

But felicity and gratefulness comes in control
These faults and virtue takes its role

As time goes on, this life is less new
The more it thinks the more things construe

Now this life, has on its own
It produced a new life, made to be grown

Remembering the old closed door
Which proposed its life and so much more

It realized what the closed door had done
So it closed its own door to gain new one

p.s this might be very confusing but its about life and death. and as one dies. another is born