While we must learn to accept unpleasant things with serenity, this does not preclude feeling angry when we feel treated unfairly by God. During severe suffering, it is unrealistic to be serene. When pain is intense, we have only one desire: to be relieved of the pain. Since God is all powerful and can relieve the pain, we are angry with Him for not doing so. The anger we have at the time of the pain need not be considered sinful, because we can relate to God as He understands us. When the pain is a matter of history, faith should become operative, and serenity will prevail.