“The task to which we are called is not the sacrifice of any principle in which we firmly believe. It is rather to return to Christ not a figure of the imagination, but the Christ of the Scriptures and to listen to His voice in obedience, to discover afresh what is the Truth. All unpretentious Bible study, every effort to disseminate a true scriptural theology, and every earnest prayer is part of the task of promoting that unity which is truly Christian. We must not envisage Christian Unity as consisting of far off and doubtful schemes, but as something very nigh which affects us all.”
“If we are really to seek for Christian Unity, we must be prepared to pay the cost. For it must be based upon love, and love is always costly. It will never be attained until there is ‘far more humility, far more thought, far more self-sacrifice, and far more prayer, than there is at present.’ (Streeter) If we are right in the conclusion that such disunion as has been sinful in the history of the Church has been due to pride, self assertion, and contempt for God’s Word and commandment, then it follows that the way to the unity which God wills [is] through humility, love of the brethren, and obedience to the Divine Revelation. When Christians pray to be shown where they have been wrong, proud, complaisant, or censorious, and to be put right; when they meet for common counsel and study of the Word, in the spirit of obedience and prepared to subject their individual opinions to the guidance of the Spirit; where the strong are willing to foster and strengthen the weak; and where all are seeking the common good rather than their own sectional interests: then the pathway to unity will become plain, and God will grant His blessing.” – G. T. Manley, Christian Unity 
What are you doing to promote Christian unity?