Sentence:  His religious beliefs provide him with plausible explanations for many conditions which cause him great concern , and his religious faith makes possible <WSD>fortitude</WSD> , equanimity , and consolation , enabling him to endure colossal misfortune , fear , frustration , uncertainty , suffering , evil , and danger . 
Meaning of the word marked with <WSD> tags:  strength of mind that enables one to endure adversity with courage