1 Emmanuel-Joseph Sieyes, âWhat is the Third Estate?â 1789 Emmanuel Joseph Sieyes: What is the Third Estate? [Excerpts] What is necessary that a nation should subsist and prosper? Individual effort and public functions.[Individual Efforts] All individual efforts may be included in for classes: 1. Emmanuel-Joseph Sieyes, âWhat is the Third Estate?â 1789 Emmanuel Joseph Sieyes: What is the Third Estate? [Excerpts] What is necessary that a nation should subsist and prosper? Individual effort and public functions.