True love is a powerful thing but certain love is actually quite rare. Ask a couple that has been happily married for most of their lives and even they will probably tell you that there were moments where they had their doubts or fears about where their marriage was headed. This is a natural part of being in a committed relationship. For some married people, they want to find a way protect themselves from this doubt, reduce the stress they are feeling, and ultimately give themselves peace of mind again. What can do all of this and more for them?