何思何虑，居心当如止水；勿取勿忘，为学当如流水。
无思无虑，心境应当平静如水；不求冒进也不忘记，学业当如流水一般永无止境。
Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.
The only thing that really matters is the relationships that we have.