A person may have an idea about himself that will prevent him from doing goo
问题描述：
A person may have an idea about himself that will prevent him from doing goo
答
A person may have an idea about himself that will prevent him from doing good
直译：
一个人可能有一个对自己的想法,阻止了他去做好事.
即：一个人可能有一用利已（/或者说自私的）想法,阻止了他去做好事.