I have an endowment policy that I put money into. The aim is that the money will grow through being invested on the Stock Market. The final value of the saving is not guaranteed and indeed I could get back less than I have put in. If, however, once the endowment matures, I get back more than I have saved is the excess amount usury? If so shall I stop putting money into it now even though in this case I would mostly likely get back less than I have so far put in because I am stopping the policy...