John Wesley on Jude 1:3

When I gave all diligence to write to you of the common salvation - Designed for all, and enjoyed by all believers. Here the design of the epistle is expressed; the end of which exactly answers the beginning. It was needful to exhort you to contend earnestly - Yet humbly, meekly, and lovingly; otherwise your contention will only hurt your cause, if not destroy your soul. For the faith - All the fundamental truths. Once delivered - By God, to remain unvaried for ever.