I don't know what it is

I don't know what it is about you
That makes my days of grey turn to blue
You have opened a door
That was closed long before

I don't know what it is about you
That lets me write these words so true
For the pain in my past
You've eased at last

I don't know what it is about you
That makes me feel I can start anew
Before I lived in sorrow
Now I'm happy for the morrow

I don't know what it is about you
That makes my life feel so new
Now each day I do not fear
Since I've found in you something dear