Ten years had now elapsed since the conversion of Paul; and during the greater part of this period, he had been busily engaged in the dissemination of the gospel. In the days of his Judaism the learned Pharisee had, no doubt, been accustomed to act as a teacher in the synagogues, and, when he became obedient to the faith, he was permitted, as a matter of course, to expound his new theology in the Christian assemblies. Barnabas, his companion, was a Levite; [70:2] and as his tribe was specially charged with the duty of public instruction, [71:1] he too had probably been a preacher before his conversion. Both these men had been called of God to labour as evangelists, and the Head of the Church had already abundantly honoured their ministrations; but hitherto neither of them seems to have been clothed with pastoral authority by any regular ordination. Their constant presence in Antioch was now no longer necessary, so that they were thus left at liberty to prosecute their missionary operations in the great field of heathendom; and at this juncture it was deemed necessary to designate them, in due form, to their "ministry and apostleship." "The Holy Ghost said--Separate me Barnabas and Saul for the work whereunto I have called them." When we consider the present circumstances of these two brethren, we may see, not only why these instructions were given, but also why their observance has been so distinctly registered. It is apparent that Barnabas and Saul were now called to a position of higher responsibility than that which they had previously occupied. They had heretofore acted simply as preachers of the Christian doctrine. Prompted by love to their common Master, and by a sense of individual obligation, they had endeavoured to diffuse all around them a knowledge of the Redeemer. They taught in the name of Jesus, just because they possessed the gifts and the graces required for such a service; and, as their labours were acknowledged of God, they were encouraged to persevere. But they were now to go forth as a solemn deputation, under the sanction of the Church, and not only to proclaim the truth, but also to baptize converts, to organise Christian congregations, and to ordain Christian ministers. It was, therefore, proper, that, on this occasion, they should be regularly invested with the ecclesiastical commission.