Open to shaping?

I was looking through the Upper Room Worship Book today, and found this prayer, based on psalm 139:

It is not you who shape God,
it is God who shapes you.
If, then, you are the work of God,
await the hand of the artist who does all things in due season.
Offer the Potter your heart,
soft and tractable,
and keep the form in which the Artist has fashioned you.
Let your clay be moist,
lest you grow hard and lose the imprint of the Potter's fingers.

I really like the Potter image in these lines.

How often do we try to shape God to our own image? How often do we limit God because of our own preconceptions or try to transform God to who we want him to be?

What does it mean to be soft and tractable for the Potter's work? I know that there are times when I am stubborn and hard, when my heart is not loving. These attitudes become obstacles to the work of the grace of God in our lives.

Are we clay in the Potter's hand? Or are we rocks, impossible to mold? Are there times when we are rubber that takes a shape and then bounces back, losing the transformation of God's work in our lives?

Do we allow God to shape us?