These are very poetic and I assume it's part of a song? I'll try to translate it the best I can, but poetry is difficult:
"For instance, if I didn't have these memories from the beginning
I wouldn't have been able to lose them.
The days keep piling up preciously one after the other,
As their overlapping does not come to pass."
This is the best I can do. I am not completely sure of my translation of the second part, but it's as close as I can get it to the original. It's hard to understand what it's trying to express outside the literal translation, but I hope this helps you! Let me know if you have any questions.