The Bottom Line
Past mistakes or missteps are all water under the bridge. Think of the future.
In Detail
Past mistakes or missteps are all water under the bridge -- you cannot dwell on them when you're thinking about what to do next. When embarking upon a new project, romance or job, you have to have an open mind and a strong 'anything is possible' attitude. Positive thinking will empower you and encourage you to take chances. Things need to be attempted in life -- even if they can't always be mastered.