As we shall see later, the most important factor in the training of good mental habits consists in acquiring the attitude of suspended conclusion, and in mastering the various methods of searching for new materials to corroborate or to refute the first suggestions that occur. To maintain the state of doubt and to carry on systematic and protracted inquiry ― these are the essentials of thinking.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "As we shall see later, the most important factor in the training of good mental habits consists in acquiring the attitude of suspended conclusion, and in mastering the various methods of searching for new materials to corroborate or to refute the first suggestions that occur. To maintain the state of doubt and to carry on systematic and protracted inquiry ― these are the essentials of thinking." in the context of "Chapter 1: "What Is Thought?" https://brocku.ca/MeadProject/Dewey/Dewey_1910a/Dewey_1910_a.html" to mean that wisdom is timeless.