Turning the pieces

Let's meet at the beach
And have picnics on Sundays
Until the dogs are old and the
cats have died
And then...
No, let's mix them up and
Learn to live, to mingle
Let every day
Be Sunday

Predictability says
That you hang back
Predictability says
That I plunge in
Incompatibility says
This won't work
Faith says
Two become one
And we spend a life time
Building our puzzle
Turning the pieces this way and that
Until we find what fits