大道之行也，天下為公。選賢與能，講信脩睦，故人不獨親其親，不獨子其子，使老有所終，壯有所用，幼有所長，矜寡孤獨廢疾者，皆有所養。男有分，女有歸。貨惡其棄於地也，不必藏於己；力惡其不出於身也，不必為己。是故謀閉而不興，盜竊亂賊而不作，故外戶而不閉，是謂大同。

禮記。第四卷。禮運第九：

昔者仲尼與於蜡賓，事畢出於觀之上。喟然而嘆。仲尼之嘆蓋嘆魯也。言偃在側曰：君子何嘆？孔子曰：大道之行也，與三代之英，丘未之逮也，而有志焉。

大道之行也，天下為公。選賢與能，講信脩睦，故人不獨親其親，不獨子其子，使老有所終，壯有所用，幼有所長，矜寡孤獨廢疾者，皆有所養。男有分，女有歸。貨惡其棄於地也，不必藏於己；力惡其不出於身也，不必為己。是故謀閉而不興，盜竊亂賊而不作，故外戶而不閉，是謂大同。

(Note: as recorded below, this was what Confucius said what he wished to see.  In modern terminology, this was his World View.)

Li Ji (The  Book of Etiquette,  One of the 5 Jing of Confucian texts), Chapter 9, Li Yun (in the fourth volume of the whole book).  These are the first two paragraphs:

Once, Confucius was the guest (one of the participants) of a ceremony at the Dukedom of Lu. After the ceremony, resting by the gate, he sighed deeply.  His student Yan2 Yan4 (also known as Zi Yiu) asked, “Why the sigh?” Confucius said: “I am too late to witness the Grand Harmony (Da Dao) as practice in the great old Kingdom.  However, I wish it can be carried out someday:“

”When the Grand Way (Da Dao) prevails, the whole world under the sky belongs to all people. The virtuous and specially abled are elected.  Honesty and trust are the norm.  Friendliness is practiced. Therefore people not only treat their own loved ones as loved ones; not only treat their own children as children. The elderly are cared for; the able adults are employed; the young ones are properly nourished and educated.  Those who are widowed, orphaned, disabled are all taken care of.  All men and women will have their own place in the society. One would rather leave extra goods out than to hide for oneself; one would not take extra benefit for ones own self interests either.  Therefore there can not be any plot of secret conspiracies; there cannot be any thievery or robbery.  As a result, There is no need of even closing the front gate.  THIS is what Da Tong, the Grand Harmony, is.“