"The letter kills, but the spirit gives life." This applies to many areas of life.
We are use words to communicate with one another. Sometimes we struggle with trying to find the right words to express our thoughts. Sometimes we bungle and say the wrong words to express our thoughts.
Some people are very much into quoting all the "right" Greek or Hebrew verb tenses. "(i.e. "The original Greek says that ......") There is a big difference between know the words ... and know what the writer was trying to say, what his true meaning was.