One of the hardest lessons in life is change.

Change will always be one of the hardest lessons in life, because it's hard to let go of things. Whether it's a feeling of guilt, a deep anger, the strong pull of love, a huge loss or betrayal by someone you trusted, adjusting to the changes is never easy. We fight to hold on and we fight to let go, because change is really hard. 
~ by Dave Hedges