Poetry must always have a moral purpose; it should instruct while it delights.
诗歌必须始终具有道德目的；它应该在愉悦的同时教导。
计算理论不仅仅是关于解决问题，还涉及理解可计算性的极限。
The improver of natural knowledge absolutely refuses to acknowledge authority as such.
When you meet with opposition, even if it should be from your husband or your children, endeavor to overcome it by argument and not by authority, for a victory dependent upon authority is unreal and illusory.
