But while admitting to the fullest extent the wonderful achievements of labour, and recognizing the fact that men of the most distinguished genius have invariably been found the most indefatigable workers, it must nevertheless be sufficiently obvious that, without the original endowment of heart and brain, no amount of labour, however well applied, could have produced a Shakespeare, a Newton, a Beethoven, or a Michelangelo.
词汇突破：to the fullest extent 完全
indefatigable 不知疲倦的
distinguished genius 杰出的天才
Invariably 总是，不变的
Endowment天赋
主干识别：it must nevertheless be sufficientlyobvious that…
其他成分：while 引导的两个现在分词短语充当的让步状语：
while admitting to the fullest extent thewonderful achievements of labour, and recognizing the fact that men of the mostdistinguished genius have invariably been found the most indefatigable workers
that 引导一个主语从句：
without the original endowment of heart andbrain, no amount of labour, however well applied, could have produced a Shakespeare, a Newton,a Beethoven, or a Michelangelo.
其中主干为：no amount of labour could have produced a Shakespeare, a Newton, a Beethoven, or a Michelangelo.
注意： no amount of labour could have produced... =
amount of labor could not have produced...
其他成分： without the original endowment of heart and brain状语
