《孟子·万章章句上·第四节》
孝子的思想，最大的就是尊敬父母；尊敬父母的最高程度，最大的莫过于以天下来奉养父母。
孝子之至，莫大乎尊亲；尊亲之至，莫大乎以天下养。
The most important idea of filial piety is to respect one's parents; the highest level of respect for one's parents is to support them with everything in the world.