Nothing is more distressing to the heart, and enfeebling to testimony, than the differences of judgment that exist among the true people of God. In the second chapter of the Epistle the Apostle traces all envy and strife to this one root – "Vainglory" (2:3). Even in the very presence of the Lord, there was a strife among the Apostles because each wanted to be accounted the greatest (Luke 22:2424And there was also a strife among them, which of them should be accounted the greatest. (Luke 22:24)). So, in the Apostle's day, there was strife, as the result of the vainglory of some who wanted to be great. And in our day, all the division and strife that has come in among the people of God can be traced to this one root – someone wanted to be great.
How, then, can we "be of the same mind in the Lord"? The Apostle clearly shows that this can only be as we are marked by "lowliness of mind," and, to have the lowly mind, he says, "Let this mind be in you, which was also in Christ Jesus." His was the lowly mind that led Him to make Himself of no reputation in order to serve others in love. Self likes to be served, and thinks it is exalted when being served by others; but love delights to serve.
If, then, we each forget self, refuse to seek a reputation for ourselves, and seek only to serve others in love, according to the lowly mind of Christ, we shall have the mind of the Lord, and "be of the same mind in the Lord."