Making efforts or observing austerities to achieve something is called saadhna while bhajan means to relish what has already been received. In other words, saadhna is done to make the things happen while bhajan is to let the things happen. So at the level of bhajan i.e. not wanting anything more from life, the individual tends to becomes sehaj (easy-going) as the need for customary vrat, tap, saiyam, niyam recedes. Therefore all our efforts should be meant for taking us to the level of Bhajan i.e. becoming a viewer instead of carrying the sense of being the doer. This is called 'drashta bhaav' whereby a devotee feels that His Lord actually performs all the actions by using him merely as an instrument.