The blubbery arms of the soft life had Bond round the neck and they were slowly strangling him. He was a man of war and when, for a long period, there was no war, his spirit went into a decline.
In his particular line of business, peace had reigned for nearly a year. And peace was killing him.
By describing how "soft life", or peace, is strangling James Bond, and how Bond's spirits goes into "a decline", it reflects James Bond sought excitement and blitz to satisfy himself. As an agent, he cannot bear to live a life or peacefulness, as it is too boring and disinterests him.
