In plain words
You may learn every branch of learning and win in the assembly; you may be a hero and fight on the battlefield; you may be born a king of kings and rule a kingdom; you may give gifts of gold and of cows; you may count the stars of the sky; you may tell the names of the living species; you may learn every one of the eightfold sciences; you may make a journey to the sphere of the moon; but holding back the body and the senses, steadying the mind and turning it inward, unwavering and even of citta at all times, the man of today cannot stand.
Embodiments of Prema!
The Three Powers
In this natural world, for every man to accomplish any small task, three powers are absolutely necessary: icchāśakti, jñānaśakti and kriyāśakti. Icchāśakti means resolving that a task should be done. But how should that task be done? In what situation should it be done, and what kind of path should be followed: the power of inquiry into this is absolutely necessary. Will the task succeed merely because this icchāśakti and jñānaśakti are there? No. This is cloth. This cloth has to be made. But for it, cotton is needed. A loom to weave it is needed. Inquiring into all these implements is precisely this jñānaśakti. The power to examine what is permanent and what is impermanent is within him. The icchāśakti that wants it done is within him. But only when the act of doing begins does the oneness of these three take on form.