The unconscious zone in the mind is like the software that can be cleansed by meditation. The hardware, the brain itself, will be tuned to hold this new software by the darshan or grace of the master.
When you clean the conscious and unconscious with meditation and create a change in yourself, the hardware may not be able to hold and sustain that effect from day one. If the master’s darshan or blessing happens, the hardware also changes to hold that effect. If you don’t get that blessing, constant meditation and teaching will eventually help change the hardware.

If a disciple is in love with the master for no reason at all, the master can straightaway change the hardware along with the software

If the hardware is old, once the new software is installed, the hardware will also get updated gradually. However, if you want a change immediately in the hardware, darshan is the right thing. Straightaway it will change the hardware.

Sometimes, without even installing the new software the hardware can be changed and the person will straightaway start radiating the new software’s quality. That can happen when a disciple is completely open to the master. Sometimes a disciple falls in love with the master for no reason. He may not be attracted to the teachings or be familiar with them, he may not be attracted to the meditation techniques or be familiar with them, but he just falls in love. If he is in love with the master for no reason at all, the master can straightaway change the hardware along with the software. These disciples will be simply radiating the quality of the teachings and meditation without even learning any of them.

As on now, both the hardware and software are directed to the outer world, the material world. The conscious portion of the software starts turning to the inner world through listening to teachings, and the unconscious portion of the software starts turning through meditation. But even if software turns inwards, the hardware will not be able to handle it. Then naturally the hardware will try its best to maintain its original nature. If the software is too strong and stays in the same tune, then the hardware will change. But immediately, if after the teaching and meditation is given, the darshan and blessing is also given, the hardware will also change and it will start holding the change. It will be prepared to hold on to the same experience.

source: Living Enlightenment