Concentrate your thoughts on your work, completely and absolutely. One hour of absorbed practice is worth forty of the casual sort.

Draw out the tone. Pull it out. Spin it. Weave it. But, never press it out or squeeze the string. By pressing the string with the bow you can check the natural vibration, and without changing the position of the left hand, the smallest fraction, you can actually lower the pitch of the note you are producing.

Keep in mind the structure of the composition while practicing separate phrases, difficult passages, etc.  Do not let your playing or your memory become “patchy” — keep each measure mentally in its place; that is, in its correct relation, structurally, to the whole.

This German word means “to play before.” Play your studies or pieces over in their entirety before any long-suffering friend who will listen. You will be amazed at the sore spots that will reveal themselves, and will make it your business to heal them as quickly as possible.