There is underlying assumption in human mind, that our life should be unrolling without problems.
And if we encounter a problem (like PD) we immediately colour situation as bad or tragic and in this way, worsen situation.
Truth is, a problem is test of life. This way life makes us grow.
Changing attitude to positive, especially for “bad” things, greatly adds to our chance of recovering from stiffness to life, from PD.
Here is a quote from Bible about that:
Romans 5 3-4:
And not only that, but we also find glory in tribulation, knowing that tribulation exercises patience, and patience leads to perseverence, yet truly perseverance leads to hope.