James Montgomery Boice made some good points on the perseverance of the saints in these following paragraphs:
This doctrine has a logical connection to the other Calvinistic distinctives, of course. Because we are radically depraved and because salvation depends on God’s sovereign acts in our salvation, we have a security that is based on his ability and will rather than our own. If salvation depended in any measure on what we were able to do or contribute to it, we would not be secure at all.
But there is a strange anomaly in contemporary evangelicalism at this point. The great majority of evangelicals are theologically Arminian. That is, they do not believe in radical depravity or election. They believe that the deciding factor in whether a person becomes a Christian and is saved is not God’s regenerating power but the individual’s free will, by which he can choose either to believe or disbelieve. In other words, he is able to put himself into the kingdom or keep himself out. But in spite of this synergistic and ultimately man-determined theology, most evangelicals nevertheless believe in perseverance, insisting that when a person is once saved, he is saved forever. It is a correct point, but Arminian theology provides no basis for it.
The Westminster Confession of Faith rightly and wisely grounds our security in God’s acts when it says of perseverance, “They whom God hath accepted in his Beloved, effectually called and sanctified by his Spirit, can neither totally nor finally fall away from the state of grace; but shall certainly persevere therein to the end, and be eternally saved” (chap. 17, sec 1).
Covenant Presbyterian Church (OPC)
Hammond, WI, 54015