刘会计说到遗憾，西方有句谚语说，人所后悔的事情，从来不是已经做过的事情，而是

More people regret things they didn't do than the things they did, even if things they did turned out badly.

(After all, with time and effort you can fix almost any mistake--but you can't go back and do the things you dreamed of doing but didn't...which means you can only think about how today would be different if you had.)