When we worry, we are secretly afraid that we are going to lose out on something. Our thought says to us, "If such and such happens, I will lose, or I will fail." We fret and worry about the future, which isn't here yet; we fret and worry about the past, which is already gone. At some point we come to see that worry doesn't change anything. What it does do is drain us of the energy we need to break through our problem to a solution. When we have a problem, in the moment we deal with that problem successfully, there is great peace of mind. Our thought quits chasing after itself; we are calm and serene. The way to find peace of mind is to stay with our problem to its solution, giving all our energy and attention, not to worrying about the problem, but to discovering our way to a solution.