Luang Pu Dune was giving advice to one of his students regarding the study of the Dhamma-Vinaya. He said:
"In the area of the Vinaya, you should study the texts until you correctly understand each and every rule to the point where you can put them into practice without error. As for the Dhamma, if you read a lot you'll speculate a lot, so you don't have to read that at all. Be intent solely on the practice, and that will be enough."
(From "Gifts He Left Behind: The Dhamma Legacy of Phra Ajaan Dune Atulo")