caught the interest of God

Karl Barth wrote in his famous essay The Humanity of God:

“What is culture in itself except the attempt of man to be man and thus to hold the good gift of his humanity in honor and to put it to work?...Above all, the fact remains that man who, either as the creator or as the beneficiary, somehow participates in this attempt is the being who interests God.” (54)

What!!! We have caught the “interest of God”? I think this is correct wording, but how it makes me tremble! There is a fear that is talked of when you finally discover you are loved. And I feel something of that sort of emotion. The questions come: am I worthy? Can I love in return? What part do I play? He is very good at loving and he is so pure, will he continue loving me when he sees that I do not always keep my word? For some reason I do not know what to say and am strangely afraid when I hear that God is interested in me.