"... the great decisive movement of Nature's yet unrealised transformation can take place. A new power will descend and change the conditions of life upon earth."
"Vigilance is the way that leads to immortality (or Nirvana). Negligence is the way that leads to death. Those who are vigilant do not die. Those who are negligent are dead already." [Dhammapada]
Surrender is the decision taken to hand over the responsibility of your life to the Divine. Without this decision nothing is at all possible; if you do not surrender, the Yoga is entirely out of the question.