I think the word "successful" makes more sense to me in this context. He was successful at prioritizing activities to achieve goals he wanted to accomplish, but

I think the word "successful" makes more sense to me in this context. He was successful at prioritizing activities to achieve goals he wanted to accomplish, but what was won? I congratulate the author on having the discipline to accomplish these things. Either way, I think it's a good example of using discipline to accomplish ones goals.