Yesterday he knocked my door,
Today he has knocked my door too,
Any difference?
Nothing at all,
...
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Knocking of door is indication of something new is going to come to you soon....Excellent positivity in your poem though word doubt is used but in positive sense.5****
Perceptions matter a lot. A trivial action like knocking a door can have great significance. The interesting point is that the same action can have a different meaning on different occasions. Great piece!