Preliminary Practices: Requesting the Holy Beings to Bestow Their Blessings
The last of the six preparatory practices for meditation is to request the holy beings to bestow their blessings on us. This has two parts: the request itself, and actually receiving the blessings. We make the request to transform our mind into the mind of an enlightened being and then we imagine that the blessings of the holy beings descend from their hearts to our body and mind in the form of lights and nectars. These pacify our negativity and obstacles, and increase our merit, lifespan, inner peace, and Dharma realizations.
The Buddhas are actually always bestowing their blessings on every living being all the time without us realizing it. By consciously making a request, we make our minds more receptive to the blessings that are already coming to us, which increases the effect of the blessings that we receive. It is similar to opening a shuttered window to the sun - the sun is there whether we open the shutters or not, but we get more sunlight directly on us if we do open the shutters. In a similar way, requesting blessings makes our mind more receptive to receiving blessings that already exist.