Full appreciation can only be realized by those who experienced the before of something. Perhaps even having to be involved in the transformation itself to fully appreciate the scope of the change involved. Before and After pictures help but still, moving that brush of paint and realizing the effort involved all adds to the experience of what just happened.
Isn't it the same way with us and the transformative properties of the living in Jesus? Those who knew us well when we were as we were can more genuinely appreciate the differences made in the changing of us. Before & After pictures do not quite translate into the tender heart that a Jesus calling reaps on the Believer over time, with the kneading of the Holy Spirit as the fruits of the Spirit are cultivated and nurtured in the lives of the Christians.
Just a thought.