We must never forget that even in heaven only God is immutable or unchanging. We are ever subject to greater transformation and improvement. But it is always a change from one stage of glory and knowledge and holiness to the next higher stage of glory and knowledge and holiness. It is one thing to be free of imperfection, but another to experience perfection perfectly. We will be perfect in heaven from the first moment we arrive in that we will be free from defect, free from sin, free from moral corruption and selfishness. But that perfection is finite, because we are finite. It is always subject to expansion. There is change, but always for the better!