The following is taken from :The Reformers And The Theology Of The Reformation by William Cunningham.
Calvin had received from God mental powers of the highest order. Distinguished equally by comprehensiveness and penetration of intellect,by acuteness and soundness of judgment,his circumstances,in early life,were so regulated in providence,that he was furnished with the best opportunities of improving his faculties,and acquiring the learning and culture that might be necessary with a view to his future labours. Led by God's grace early and decidedly to renounce the devil,the world,and the flesh,and to devote himself to the service of Christ, he was also led,under the same guidance,to abandon the Church of Rome,and to devote himself to the preaching of the Gospel,the exposition of the revealed truth of God,and the organisation of churches in accordance with the sacred Scriptures and the practice of the apostles. In all these departments of useful labour his efforts were honoured with an extraordinary measure of success. Calvin did what the rerst of ther Reformers did, and, in addition, he did what none of them did or could effect. He was a deligent and laborious pastor. He gave much time to the instruction of those who were preparing for the work of the ministry. He took an active part in opposing the Church of Rome,in promoting the Reformation,and in organising Protestant churches. Entering with zeal and ardour into all the controversies which the ecclesiastical movements of the time produced,he was ever ready to defend truth or expose triumphant error. This was work which he had to do in common with the other Reformers,though he brought higher powers than any of them,to bear upon the performance of it. But in addition to all this, he had for his special business,the great work of digesting and systematising the whole scheme of divine truth,of bringing out in order and harmony,all the different doctrines which are contained in the word of God,unfolding them in their mutual relations and various bearings,and thus presenting them,in the most favourable aspect,to the contemplation and the study of the highest order of minds.
The systematising of divine truth,and the full organisation of the Christain church according to the word of God,are the great peculiar achievements of Calvin. For this work God eminently qualified him,by bestowing upon him the highest gifts both of nature and of grace; and this work he was enabled to accomplish in such a way as to confer the greatest and most lasting benefits upon the church of Christ,and to entitlke him to the commendation and the gratitude of all succeeding ages. (pages 293,294)