Sentence:  But the most highly gifted of all peoples in poetic insight were the Greeks. They possessed supreme ability in the interpretation of nature as expression of spirit. They have countless <WSD>mythoses</WSD> to express the immortality of man and his after-life. 
Meaning of the word marked with <WSD> tags:  A story or set of stories relevant to or having a significant truth or meaning for a particular culture, religion, society, or other group; a myth, a mythology.