A strong church is deliberately established on the foundation of Christ and the Apostle’s teaching. The Apostle Paul frequently contended for the gospel throughout his letters to the churches and instructed elders to do the same. He went so far as to recommend the cursing of angels if they sought to change the core teaching of our faith (Gal. 1:8). Churches today are under similar attack and elders are tasked with guarding doctrine and contending with those teaching a “different gospel.” Strong churches know that the “deposit” we have been handed is to remain unchanged as it is our lifeblood as a community of faith. 

For no man can lay a foundation other than the one which is laid, which is Jesus Christ.
— 1 Corinthians 3:11

My father’s old style test for ministers: “Do they lift Jesus up?” But what else could it be, if Jesus is the key to God and humanity?
— Miroslav Volf

Revival, above everything else, is a glorification of the Lord Jesus Christ, the Son of God. It is the restoration of him to the center of the life of the Church. You find this warm devotion, personal devotion, to him. 
— Dr. Martin Lloyd-Jones

Only a fraction of the present body of professing Christians are solidly appropriating the justifying work of Christ in their lives... Many... have a theoretical commitment to this doctrine, but in their day-to-day existence they rely on their sanctification for their justification... drawing their assurance of acceptance with God from their sincerity, their past experience of conversion, their recent religious performance or the relative infrequency of their conscious, willful disobedience. Few know enough to start each day with a thoroughgoing stand upon Luther’s platform: you are accepted, looking outward in faith and claiming the wholly alien righteousness of Christ as the only ground for acceptance, relaxing in that quality of trust which will produce increasing sanctification as faith is active in love and gratitude... Much that we have interpreted as a defect of sanctification in church people is really an outgrowth of their loss of bearing with respect to justification. Christians who are no longer sure that God loves and accepts them in Jesus, apart from their present spiritual achievements, are subconsciously radically insecure persons... Their insecurity shows itself in pride, a fierce, defensive assertion of their own righteousness, and defensive criticism of others. They come naturally to hate other cultural styles and other races in order to bolster their own security and discharge their suppressed anger.
— Richard Lovelace, Dynamics of Spiritual Life