".... If trust breaks down, social relationships break down. Society will then depend on law enforcement agencies or some other use of force. When force is widely used, society is no longer free. The only way free human beings can form collaborative and cooperative relationships without recourse to force is by the use of verbal undertakings honored by those who make them.
Freedom needs trust. Trust needs people to keep their word, and keeping your word means treating words as holy, vows and oaths as sacrosanct. Only under very special and precisely formulated circumstances can you be released from your undertakings. That is why, as the Jews approached the Holy Land where they were to create a free society, they had to be reminded of the sacred character of vows and oaths.
The temptation to break your word when it is to your advantage to do so can sometimes be overwhelming. That is why belief in God – a God who oversees all we think, say, and do, and who holds us accountable to our commitments – is so fundamental. Although it sounds strange to us now, the father of toleration and liberalism, John Locke, held that citizenship should not be extended to atheists because, not believing in God, they could not be trusted to honor their word.
Understanding this, we can now appreciate that the appearance of laws about vows and oaths at the end of the book of Numbers, as the Jews are approaching the land of Israel, is no accident, and the moral is still relevant today. A free society depends on trust. Trust depends on keeping your word. That is how humans imitate God – by using language to create. Words create moral obligations, and moral obligations, undertaken responsibly and honored faithfully, create the possibility of a free society. So never break a promise. Always do what you say you are going to do. If we fail to keep our word, eventually we will lose our freedom."