It is up to you to make strong effort; buddhas merely tell you how.
It would be interesting to see a tally of all the spiritual books I have bought in my lifetime, as well as the classes and seminars I've taken. In a second column would be what I learned from each, and in a third, what I put into practice from that knowledge. I'm sure that third column would look a little empty. It is comparable to pouring water into a pot with a hole in the bottom. Now the ego loves learning this way; it doesn't have to change, but it can put lots of books and seminars on its spiritual resume (making it look very impressive). But as the Buddha states, the goal is to change my inner self, not chase after spiritual materialism (which changes nothing except my monthly credit card statement).