The problem:
our actions produce results, but they are often delayed
Most of the time, we don't get instant feedback about our work so we are left with doubt: is this really working?
Sometimes, things get worse before they get better, even if we are already on the right path. It's during this first phase, when things aren't looking good, that most people give up.
That's why we need a system to stick to, a plan to follow even if results take a while to show up. They will, eventually.