Eph 4:2b with longsuffering, bearing with one another in love, 3 endeavoring to keep the unity of the Spirit in the bond of peace. 4 There is one body and one Spirit, just as you were called in one hope of your calling; 5 one Lord, one faith, one baptism; 6 one God and Father of all, who is above all, and through all, and in you all.
Our heart has many pacemaker cells that keep the heart beating in rhythm. When it gets out of sync, it can cause many problems, even making the heart burst apart. It can cause the same thing in the body of Christ when we are not unified, we have many problems and even break apart instead of being one as Jesus said we were to be in John 17:21 "that they all may be one, as You, Father, are in Me, and I in You; that they also may be one in Us, that the world may believe that You sent Me.
Verses 2 and 3 depict attitudes, not techniques or methods. In world, and even in evangelical circles, people are more interested in techniques than in attitudes. They buy books written by people who appear successful, and who tell them how to be successful, too. The Bible has little to say about techniques and methods. It has much to say about obedience and about the attitudes which are conducive to godly conduct.
Believers’ attitudes are important. These attitudes which Paul calls for in verses 2 and 3 are necessary because they are the attitudes of our Lord Himself (see Philippians 2:5-8). If we are to reflect Jesus Christ to the world in which we live, then we must manifest His attitudes. Furthermore, these attitudes are those which promote Christian harmony and unity.
Humility is listed first because of Paul’s emphasis on unity (pride promotes disunity; humility promotes unity) and to counteract their past pride, so as to facilitate obedience to and dependence on God. Christ was the supreme example of humility (Phil. 2:6–8).
Seven elements of unity follow that unite believers in the church. Believers should remember them when tempted to break unity. Again all three members of the Trinity are in view and play a part in this process.