Is this suposed to be about a book????????????
Greek and Latin matter because it helps us with the pronunciation of words and the origin of words. When we know about where these words come from, how they are broken down (with suffixes and prefixes), and how each are pronounced, you better understand not only the word, but the meaning and the logic behind the word. This also aids in reading comprehension. Greek and Latin is key to understanding vocabulary, and a good vocabulary helps you to understand what you are reading.
Answer:
Normally, this idiom means you can provide for yourself; standing on your own two feet is like "I don't need any help from anyone else, I can take care of myself." I hope this helped :)
Definition is: of great significance or value. It´s an adjective. Does that help?