Between Making Decisions

I wonder often how much volition we really have in our own lives. How can you know how one choice today will show in the reprocussions of your days 10 yrs from now ? (How about 30? How about 130?) How about in other people's days ? Much of what keeps us up in restless nights might be so much dust on so much wind. Perhaps small choices have unknown impacts. Who knows ? But I like to wonder.