Huston Smith, scholar of comparative world religions, points out that, just as our body sometimes has "the flu", so also, sometimes we have a "spiritual flu". We are a dynamic process with vicissitudes, we are not absolutes or ideal.
No physical body is perfect or flawless. Every living being has some flaw and some illness or malfunction. Why do we assume that everyone is mentally or morally perfect. The mind and the soul must also naturally suffer from certain imperfections.