The human heart is the most deceitful of all things, and desperately wicked. Who really knows how bad it is?

读经书，阅传注，就为治学打下坚实基础；看史籍，鉴古今，就使宏论滔滔切中肯綮；游山川，观壮景，就使志气凌云眼界开阔；戒嗜好，弃私欲，就使胸怀磊落一尘不染。