Unlock the past

Meaning, here, is shared between two things: what you’ve been given, and something already set in place. Find the latter, and the former will begin to make sense.

4-1-3-1 6-2-1-3 3-4-4-5

1-5-4-1 7-2-5-2 6-2-2-1 2-4-1-3

5-2-1-2 1-5-9-9

4-2-2-1 2-3-4-5 7-3-2-2 3-4-4-7 5-2-2-5