Basic Principles in Pianoforte Playing

Not until just recently, I found the great value of the work by Josef Lhevinne, "Basic Principles of Pianoforte Playing".
Not only the author is an outstanding performer and instructor, and not only for its thoroughness yet conciseness, but also the insights that are unique and tested over time, and above all, the delivery of the thoughts I found very creative and effective.
If we practice these thoughts in their true intended meanings to the fullest, no doubt our performances will reach the height where we performers and the audience as well could truly appreciate the art of piano playing.
Key thoughts that I particularly found valuable are:

1. What "touch" is to loosen all but absolutely necessary muscles to enable the most artistics fingertips to work themselves, without any obstacles or hitches, to create the beauty of sounds.
2. The "touch" is not to strike or drop the fingertips on the keys but to capture the keys.
3. Tha last note of a passage should be paid careful attention so that the passsage ends delicately, with a reversed (at the beginning of the passage), smooth motion.
4. The left hand dexterity is the one distinguishes the great performance from the mediocre ones. It should not be a drag. Thus, you should be able to play the left hand part solidly and independently with equal mastery with the right hand part.
5. Stop for a while to look back on your performance and think carefully if you have something to express, assert, and deliver to the audience.