The aim of this book is hidden in one of these lines...can you find out which?

A note, never unfolded

A doorbell, unanswered

A phone, turned off

A text never read

A gap, never filled

A sentence, half-finished

Some words, left unspoken

Syllables dying unheard...

...Say what you want to

Right now in this moment

Tomorrow's just a myth

People change in a second

So hug me when you feel like it

Say 'no' out loud if you have to

We have endless time to overthink,

But now's the turning point.