If our Pains & Sufferings...our sadhna for god ?

Pains and sufferings, though felt hurdles/obstacles in Sadhana, are essential for building endurance in sadhaka. They are to be overcome by determined continuance of Sadhana. One who fears and leaves in between, he can not get ultimate benefits. Pang of seperation should be overcome by thinking 'while coming in the world and while leaving the world, one has to come and go alone'. Pains, physical and mental are to be overcome by thinking 'pains of taking birth and leaving this world are very severe hence the present one felt is nothing against them are there for my exam / test, I should bear it'.