The Only Cure
Lehmann said of this scale: "It is the only cure for all injuries, and at the same time the most excellent means of fortification against all over-exertion. I sing it every day, often twice, even if I have to sing one of the heaviest rôles in the evening. I can rely absolutely upon its assistance. I often take fifty minutes to go through it once, for I let no tone pass that is lacking in any degree in pitch, power, duration or in single vibration of the propagation form."
Personally I supplement this great scale often with various florid legato phrases of arias selected from the older Italians or Mozart, whereby I can more easily achieve the vocal facility demanded by the tessitura of Manon or Faust and change to the darker-hued phrases demanded in Carmen or Butterfly.
But the open secret of all success is patient, never-ending, conscientious work, with a forceful emphasis on the WORK.