Have you ever noticed that in a conversation about something serious, some people talk a lot of nonsense, but when it's time to say something that actually helps, they go quiet? That happens because small talk doesn't need studying, but important matters do.
The Bible says the words of the wise are too deep for fools to understand, and that when it's time to discuss important things, fools have nothing to say. It's not that they're dumb, it's that they didn't prepare.
Think about a test at school: whoever studied can answer the hard questions. Whoever didn't study stays quiet, trying to guess, hoping not to get called on. Preparation is what gives you something worth saying.
Jesus used to tell stories (parables) that seemed simple but had a deep meaning. Whoever really wanted to learn paid attention and understood more and more. Whoever just wanted to pass the time understood nothing. The more we truly seek to know Jesus, the more depth we gain to speak about life.
Whoever prepares has something to say when it truly matters.