I. "Rejoice evermore." The Thessalonian converts were living in the sphere of sorrow. The Apostle exhorts them to be "girded with gladness." This rejoicing, being in the Lord, is opposed to the spurious joy which is the possession of sinners. The rejoicing before God is the deep, calm delight of the soul in communion with the Saviour. It springs out of the three Christian graces which this epistle so strongly emphasises faith, hope, and love.
II. "Pray without ceasing." Prayerfulness is the atmosphere in which all things appear bright and joyous. The Apostle takes it for granted that none of his readers will call in question the duty of prayer. What he enjoins is constancyin prayer. The only conceivable way in which, on our part, this communion may be maintained, is the lifting up of the heart in conscious dependence and petition. The Church militant must ever be the Church suppliant. Prayer is the very beating of the pulse of the Christian's inner life. Without it life would cease to be.
III. "In everything give thanks." The clause seems to suggest not merely that the heart is at all times, and for all things to be grateful, but that the gratitude is to overflow into every action of the life thanks giving and thanks living. Here is a sense in which we are evermore to pay back, as it were, in active service, what we receive from God. That debt ever due, never cancelled, we have ceaselessly to pay, and in paying it to find our highest joy.
J. Hutchison, Lectures on Thessalonians,p. 216.
Reference: 1 Thessalonians 5:16-18. A. Murray, With Christ in the School of Prayer,p. 242.