Himmler in his Poznan speech:
'We have developed according to the law of selection. We have chosen the elite from among a cross-section of our people... We have gone partly by external appearance and then have ..— tested appearance against continually new requirements, continually new tests, physical and mental, of character and of spirit. We have again and again sought out and cast off what doesn't meet these requirements... We are pledged whenever we come together to remind ourselves of our fundamentals, race, selection, hardness' (IMT, XXIX, 1919-PS).
From Chapter 9, Heinrich Himmler, Part 2 of The Face Of The Third Reich by J.C. Fest — See further Notes