to think is easy. anyone can produce thoughts. however ridiculous they could be. what's harder is learning how to think which in this case should be priority for everyone. learning how to think basically gives you a firm structure which from that branches out into many vertex that eventually shapes who you are. without that structure you as an amalgamation of thoughts can be just shapeless.
you can easily read people from the way they answer questions. sometimes the best way to argue is to ask questions. someone who answers questions without a clear structure will eventually get tired of his own points and give up.