Knowledge is strengthened through active application and sharing rather than passive accumulation.

Original passage

Let the youth advance as fast and as far as they can in the acquisition of knowledge. Let their field of study be as broad as their powers can compass. And, as they learn, let them impart their knowledge. It is thus that their minds will acquire discipline and power. It is the use they make of knowledge that determines the value of their education. To spend a long time in study, with no effort to impart what is gained, often proves a hindrance rather than a help to real development. In both the home and the school it should be the student's effort to learn how to study and how to impart the knowledge gained. Whatever his calling, he is to be both a learner and a teacher as long as life shall last. Thus he may advance continually, making God his trust, clinging to Him who is infinite in wisdom, who can reveal the secrets hidden for ages, who can solve the most difficult problems for minds that believe in Him.