(I was trying to recreate the look of the "Simple Philosophy" piece and did not succeed so now I have three slightly different versions of the same thing!.)
Have you ever been hurt by someone and you close your heart tightly and vow never to allow yourself to be hurt again? Have you ever held too tightly to a friendship because you were afraid to let go, afraid you would lose the friend? Have you ever just settled for the way things are now because you were afraid that what you had was a good as you were going to get?
We cannot be free to give or receive if our hands are holding our heart, or a friendship, or the "status quo" in our lives too tightly and too protectively.