Cursing, taking God’s name in vain, violates the Third Commandment (Exodus 20:7). In the third chapter of his Epistle, James warns how easily we sin with out tongues. He underscores that point when, in James 3:9–10, he points out the utter contradiction of using our tongues to bless God and then using the same organ to curse men, who are made in the likeness of God.
What sets mankind apart from the rest of creation? God made us in his image. Instead of just speaking us into existence, the pattern set earlier in Genesis 1, God deliberately creates mankind, male and female, in his own image and likeness. Although sin warps that image, mankind is still image of God. That gives value to human life (Genesis 9:6) and is reason to protect even the most vulnerable in our culture — the yet to be born and the elderly. Taking life unjustly sins, not only against the victim, but also against the God who created that person in his image.
Several years ago the presbytery of which I am a member was so seriously affected by divisions that the General Assembly appointed a committee to visit and seek to assist us. While there was a theological issue that was the focal point of much contention, the Committee to Visit the Presbytery of the Northwest reported to the General Assembly its view of underlying problems which had resulted in two congregations withdrawing from the OPC with their pastors and a third minister renouncing the jurisdiction of the OPC. The Committee spoke of “divisive speech and attitudes” in the presbytery. It reflected on “the mistaken notion that the PNW merely suffers from a theological dispute leads to an unhelpful tendency to inadequately address and acknowledge the more significant causes of division…. On the personal level, brothers within the presbytery have failed at crucial times to deal openly and honestly with one another about various personal grievances.” (quotes from the Minutes of the Eighty-third General Assembly, p. 326).