The Apostle Paul
Romans 12:12BSB·traditional attribution

Be joyful in hope, patient in affliction, persistent in prayer.

John Calvin Reformed

12. Rejoicing in hope, etc. Three things are here connected together, and seem in a manner to belong to the clause “serving the time;” for the person who accommodates himself best to the time, and avails himself of the opportunity of actively renewing his course, is he who derives his joy from the hope of future life, and patiently bears tribulations.

Matthew Henry Presbyterian

We may observe here, according to the scheme mentioned in the contents, the apostle's exhortations, I. Concerning our duty to God, We see what is godliness. 1. It is to surrender ourselves to God, and so to lay a good foundation. We must first give our own selves unto the Lord, Co2 8:5. This is here pressed as the spring of all duty and obedience, Rom 12:1, Rom 12:2.

Commenting on Romans 12:1-21

John Gill Reformed Baptist

Rejoicing in hope,.... Of the glory of God, than the hope of which nothing can make a believer more cheerful in this world; the saints' joy is therefore called the "rejoicing of the hope", Heb 3:6. This is placed between serving the Lord, and being patient in tribulation; for nothing tends more to animate the people of God to a cheerful serving of him, or...