Banner Of Truth
"Thou hast given a banner to them that fear thee..." Psalm 60:4

The Indispensability of Edification By Rodney Jordan
In Christ Jesus, edification involves being made strong in the faith—that is, coming to a point where believing is the inclination of the heart, and doubt and fear, lose their prominence. It also includes the enhancement of spiritual joy. This occurs when the blessing of the Lord eclipses the trials of life, and the promises of God become more prominent than the troubles and difficulties of human experience. Edification also broadens hope, which is a stabilizing anchor for the soul (Heb. 6:19). (Hope is the firm conviction that what God has promised applies to you. When hope is strong, the waves of trouble and storms of hardship will not shake the soul, even though they are often difficult to bear. Hope keeps the light of promise burning brightly — so the glorious conclusion of the race of life can be seen more clearly than the troubles along the way). 
Remember the Apostle Peter, he walked on the water, but when he saw the waves he begin to sink. We can be the same way as Peter as long as we have hope in Jesus Christ then we can walk above the waves of the storms of this life or go through them by being edified by the body of Christ. We need each other for encouragement and hope so we can endure the storms of this life.
Edifying the people of God is the preeminent, or the main, activity of the church. This is the great commission given to the church (to edify one another), and if the people of God are built up they will win souls for Christ. If the people of God are not strengthened, it makes no difference what else may be thought they have accomplished. The edifying or strengthening of the church, the people of God, is the objective of Christ’s gracious gifts to the church: “apostles, prophets, evangelists, pastors and teachers” (Eph. 4-11-12). 
On an individual level, each believer is to seek to please his “neighbor for his good unto edification” (Rom. 15:2). Edification means the Bible becomes clearer, heaven comes closer, and the persuasion of the reality and accessibility of the promises of God becomes stronger. Confidence and assurance rise to prominence within the heart when one is edified. Christians who are built up are convinced they are able to obtain what God has promised. Those who are edified are like Abraham, they will not stagger at the promises of God, but will be strong in faith; being fully persuaded that God is able to do what He has promised. And when you are edified you become more determined to finish the race God has set before you (Heb. 12: l-2).

There is no substitute for edification—no religious activity that will compensate for a lack of it. If you are not strong in your faith, it makes little difference what other seeming qualities you may have. Tragically, it is possible to have a lot of religious activity that has no lasting impact for good upon the soul. Such activities do not require the work of God, the intercession of Jesus, or the work of the Holy Spirit. God’s Word is easily placed in the background during such activities, the Holy Spirit is quenched, and the ministry of holy angels is seen as inconsequential. God has made no place for such distracting and neutralizing activities among His people, even though they are major areas in many churches. 
The road to glory is too long and hard or restrictive or narrow for the child of God to be weak (Matt. 7: 13-14). The trials of life and oppositions of Satan are too significant for any person in Christ to lack power, confidence, and strong determination.
Edification equips you for such circumstances. It helps the runner to run, the fighter to fight, and the believer to trust. Everything about salvation is calculated to edify you.