American writer Thomas Wolfe once said "Ecclesiastes is the greatest single piece of writing I have ever known and the wisdom expressed in it the most lasting and profound". The Byrds wrote a song called "Turn Turn Turn" which included some lines from it. Abraham Lincoln used a line in one of his speeches from it. "One generation passeth away and another generation cometh but the earth abideth forever. What follows is Ecclesiastes 3.1-3.8 and it isn't really religious per se. I think Atheists wouldn't object to it. "To everything there is a season and a time to every purpose under the sun. A time to be born and a time to die. A time to plant and a time to pluck up that which is planted. A time to kill and a time to heal. A time to break down and a time to build up. A time to weep and a time to laugh. A time to mourn and a time to dance. A time to cast away stones and a time to gather stones together. A time to embrace and a time to refrain from embracing. A time to get and a time to lose. A time to keep and a time to cast away . A time to rend and time to sew. A time to keep silence and a time to speak. A time to love and a time to hate. A time of war and a time of peace". WHAT TIME IS THIS AND WHAT IS THE LESSON TO BE LEARNED?
I dunno, Rosie. It can only be a matter of opinion.
If "great" means style and content then of course it's hard to go past a Shakespeare or a Tolstoy.
If it means impact and endurance, we'd have to think about Paradise Lost or The Inferno. Both are powerful.
If it refers to influence then we have to look back at the works of the old Greeks or perhaps the scriptures of the various religions.
But if I was to be deprived of all books except one of my choice it would have to be The Rubaiyat of Omar Khayyam and, although I think Le Galienne's paraphrase is the more accurate, I'd have to go for Fitzgerald's version.