I was reading the latest on Brad Warner’s Hardcore Zen blog last evening — always worthwhile as Brad is eminently sensible and a Zen master.
He was writing about greed, especially greed for good.
And he nailed why it is that so many of us get frustrated that, while we can make a difference, we can’t make the huge difference that we know is needed. We are being greedy for the goodness we are striving after, and in Zen greed (any greed) is one of the “three poisons”.
Here’s the key extract of what Brad had to say. [My explanations in brackets.]

Greed … does not differentiate between good and bad. We’re used to the term greed being applied to things that are either bad for us or to things that are good or neutral except when over-indulged in … greed doesn’t just get directed towards bad things. You can also be just as greedy for good stuff, for things no one would ever say you shouldn’t want …
Back when I was an employee of Tsuburaya Productions [Japanese company who made the Godzilla films], I found myself getting really frustrated with how things were going. I was very dedicated to the company and I knew we could be doing much better than we were. I saw great opportunities for us internationally that we were just passing by because our management refused to see them or take steps to realize them.
During this time I went and saw Nishijima Roshi [his Zen teacher] and complained bitterly about the situation. Nishijima had been a businessperson most of his working life. He understood that side of things very well. I recall once telling him that Tsuburaya Productions was wasting its opportunities because it had no goals. I caught myself and said that I knew Zen was supposed to be goalless. He said, “Yes. But in business you must have a goal”.
So he got what I was saying that day about my frustrations with the company. But he said I needed to be satisfied with making small changes. Those small changes were important and eventually could lead to greater things. He didn’t exactly tell me not to be greedy, but that’s what he was saying.
The same attitude can be applied to the kinds of noble and important work a lot of people I meet are involved in. A lot of these people are terribly frustrated because they can’t seem to make the sweeping changes they know need to be made in order to fix the problems they’re working on. But many of these problems are global in scale …
It’s unrealistic to expect great changes to happen quickly. Getting greedy for good things only makes matters worse. We start getting angry and depressed, leading us to be unable to be effective in our important efforts to do what needs to be done.

This is something which hadn’t struck me before but on reflection is both correct and important. And it is something I (and probably many others) need to take on board.
Don’t be greedy for change. Yes, have a goal, but be prepared to progress towards it one small step at a time. “Softly, softly, catchee monkey.”