With Regard to Technical Work:

Play good compositions and construe out of them your own technical exercises. In nearly every piece you play you will find a place or two of which your conscience tells you that they are not up to your own wishes; that they can be improved upon either from a rhythm, dynamic or precision point of view.

Give these places the preference for a while, but do not fail to play from time to time again the whole piece in order to put the erstwhile defective and now repaired part into proper relation to its context. Remember that a difficult part may "8°" pretty well when severed from its context and yet fail utterly when attempted in its proper place. You must follow the mechanic in this. If a part of a machine is perfected in the shop it must still go through the process of being "mounted"—that is, being brought into proper relation to the machine itself—and this often requires additional packing or filing, as the case may be. This "mounting" of a repaired part is done best by playing it in conjunction with one preceding and one following measure; then put two measures on each side, three, four, etc., until you feel your ground safely under your fingers.

Not until then have you achieved your purpose of technical practice. The mere mastering of a difficulty per se is no guarantee of success whatever. Many students play certain compositions for years, and yet when they are asked to play them the evidences of imperfection are so palpable that they cannot have finished the learning of them. The strong probability is that they never will finish the " study " of them, because they do not study right.