Luk 15:7 I say unto you, that even so there shall be joy in heaven over one sinner that repenteth, more than over ninety and nine righteous persons, who need no repentance.
Kingdom building is just that, to AFFECT the Kingdom of God and to INFECT the kingdom of hell, by following the commands of Christ to Go Ye Therefore to preach the Gospel to the poor, to set the captives free and to proclaim the acceptable year of the Lord. To make heaven rejoice, and heaven doesn't rejoice over us having a nazi mobile (benz, bmw, saab, porche, etc) it doesn't rejoice when we get a big house, doesn't rejoice when we wear the latest fine clothing created by a homosexual designer like "versace", it rejoices when we go to the hiways and biways to seek and to save that which is lost. To go to the unevangelized parts of the world where still there are 1.8 billion people who never heard the name of Jesus the Christ to give them the same oppurtunity to accept or to reject the only name that has the power and the authority to redeem us from a death sentence. To go make disciples, not just saved folx is the command of Christ, to go to the utter most parts of the world as true Apostles and Ambassadors of Christ and to give up this way of life, to save our lives, by engaging in the Global harvest where its plentious but the workers are sho nuff few. To give up all, just like our Savior gave up His very life for us as a living sacrifice. As Jesus the Christ said, "Is the slave greater than the master?" That's how you make heaven rejoice, by bringing others the Good News of the free give of salvation.
Kingdom building is doing the will of the father getting out and telling people about jesus preaching the message of god helping others to direct their path in the way god wants it to go.Building up the church becoming a body of people the can serve and show love. There are so many wonderful things when it comes to kingdom building as well as some painful things too but change is progressing that's what kingdom building is change Gods change working on unity among the believers putting away jealousy and pride and just build off of what god has given us to work with so he can say your are a good and faithful servant.