It’s obvious to any good martial artist. It’s why the Japanese Karate guys hit Makiwara boards. It’s why the Chinese arts are called Kung Fu (hard work). It’s why we do what we do.
But all contention is a matter of controlling the exchange of energy, even in the arena of debate. Your opponent may want to distract, obfuscate or distort reality. If your weapons are soft, you will not be able to prevent him from doing this and swaying the innocent to falsehood. Your weapons in a debate are logic, effective rhetoric, grammar skills and a good knowledge base.
GRAMMAR? Whether you like grammar or not, it is a tool, a weapon, a power in this world. Even if you are knowledgeable and intelligent, one misspelling or a poorly worded sentence will make you look like a fool to anybody who knows better. And they may naturally come to give less weight to everything you say as a result. It may not be fair, but it’s true. You can either be well armed or bear a balsawood sword into battle. Think about it.
There are many arenas in your life that you will regularly have to contend in. Are there any of them that you want to be regularly defeated in? What are your weapons in each arena? Are they steel or balsa? If defeat is not an option, then there is no alternative to making yourself strong.