Q: I lost a considerable amount of money because of others' mistakes. Can I stand on God's word in Proverbs 6:30-31 to believe for restoration?
A: To answer your question, let me begin by pointing out that the Book of Proverbs as a whole is not presenting absolute promises but rather observations of life in general. These are pithy statements providing general principles of life, but they do not necessarily contain actual promises. This is not to say there are no firm promises in the Book of Proverbs but generally these are connected with the Mosaic Law. What was true under the Law is not necessarily true under grace.
Proverbs 6:30-31 does not mean that because a believer's money was stolen, he would automatically have it restored either to the same amount lost or as in this case "sevenfold." This may happen, but the passage does not promise it. Therefore, it cannot be “claimed.” The loss of money does not mean that you did anything wrong. The fact is that believers live in a sinful world. As a result, believers must sometimes suffer the consequences of living in a sinful world. God does not promise such restoration in this life.