If i desire enough, will i get it?

This afternoon I have one round of conversation with my regional senior about one business decision. We came to a small debate about our different view on this decision. Although I am still not convinced by his reasoning, but I totally agreed with him that I have to beef up my communication. Unfortunately this is what matter most to a "consultant", communication determine 50% (or more) of our success, it's not even whether we are make a clever judgement / action. He sharply pick up that I have to avoid the repetitive words like "I know" and "But" etc. We have totally different stands in few issues, but I am overwhelmed and not able to convince him, even i am convicted with my belief. Again, that shows how sucks i am. I don't agree with some of his stands, but he can swarm me with his speech until I have to give way to resists. No doubt this is something that i need to improve on, the pitiable able side of the story, the world is not always reigned by the best decision maker, but the best persuader. I am not saying that i'm the right one in this scenario, i just figure if someone who can persuade but not making the right decision, that where things break and failed in this world.