What are the methods to develop unruffled serenity and mental composure under all conditions of life ? Is absolute serenity possible of attainment?

Yes. By all means. Consider yourself as dead to the world or the world as dead to you.
Develop Atma Vichar Sakti. Identify not with the mind, senses and intellect or with any of the
other modifications of the mind. Always be engaging yourself in the thought of the Divine.
Have no thought of yourself or the surrounding world. Be absolutely indifferent to yourself, as
you ought to be towards the surroundings, the various daily happenings and the worldly
repercussions. Knowledge of the Self, when o… http://bit.ly/9M54pD

If escape from this world be the goal, where is the incentive for social work?

Escape from the world is not the goal, but freedom from worldliness is what is desired.
Social work has got its own valuable part in life until a certain stage, though after a time it is
transcended by a higher consciousness. The value of social work, however, is purely subjective.
It is not that one makes himself a great reformer or a saviour of mankind, but that he offers his
ego as a sacrifice at the altar of universal love and so obtains purity of mind, which is the basis of
all spiritual pr… http://bit.ly/cX0e7a