People often feel mentally exhausted because they constantly waver between persistence and giving up.
人们常常感到精神疲惫，因为他们不断在坚持与放弃之间摇摆。
该句使用因果结构表达心理状态与行为选择之间的关系。
"The path of life is carved through our own choices and sacrifices."
"To live the life you want, you must be brave enough to give up certain things."
"Our lives can become a magnificent art gallery or a dark, living grave; it is a choice we each make."
"Life presents far more choices than we imagine."
"If honesty is a harm, choose a lie."