Mananeeya Eknathji stresses that the worker should have the attitude as said in the Gita : Madarthamapi karmani kurvan siddhimavapsyasi B.G.12.10.
Doing karma for Ishvara's sake is doing it as an expression of your devotion to him. This is Ishvarartham karma. Further, Ishvara is in the form of Dharma. Sanatana Dharma is a name for the Vedic tradition. This dharma, which is unfolded by the Vedas is eternal, Sanatana . Here we view Ishvara as the very order in the world. Or we can say it is the dharma of the one who is eternal. In this, Ishvara becomes the nimitta. Conformity to his order is Ishvararpit karma. Either you think, 'I perform this action for the sake of Ishvara' or 'In conforming to dharma I am worshipping Ishvara.' Both are similar. And this attitude would make one humble and take up the work that has come to his lot as given by the God and also doing it for the sake of God.