This means that God requires that we should offer ourselves to be sacrificed in His cause. We shall achieve steadfastness when all our faculties and powers are devoted to His cause and our death and our life are all for His sake, as He has said: That is, proclaim, O Prophet: My prayer and my sacrifices and my living and my dying are all for the sake of Allah.
When a person’s love of God reaches a stage at which his living and his dying is not for his own sake but is entirely for God, then God, Who has always loved those who love Him, bestows His love upon him and by the meeting of these two loves a light is generated inside the person which the world cannot recognize or understand.