A blessing is a transformation of our mind from a negative state to a positive state, from an unhappy state to a happy state, or from a state of weakness to a state of strength through the inspiration of holy beings such as our spiritual guide, Buddhas, and bodhisattvas. Geshe-la says:
“From our own side, it is difficult to cultivate and maintain a peaceful and positive mind. We know this from our own experience; although no one wants to have negative minds, they arise without choice. In reality, the only way to develop a positive, peaceful, and calm mind is to receive blessings from Buddhas and Bodhisattvas. Of course, Buddhas do not bless only the minds of Buddhists, but the minds of everyone - non-Buddhists, religious people, non-religious people, even animals. For example, through receiving blessings even animals can sometimes develop positive and peaceful minds, and at that time experience some happiness.
Our friends and relatives cannot help us to develop a peaceful and calm mind, and can sometimes even act as a cause for us to develop negative minds. However, if we check carefully within our own experience, we can see that sometimes, for no particular reason, we naturally develop a calm and peaceful mind. Where does this experience come from? I can say that it is definitely the result of receiving Buddha's blessings at that time. In this way, we can understand that our happiness depends upon a positive mind, and this depends upon receiving Buddha’s blessings. There is no other source from which we can develop a positive mind.
Therefore receiving blessings is important both for those who seek Dharma realizations and for those who seek ordinary happiness. Without receiving blessings it is difficult to develop even a temporary peaceful mind, and even if occasionally we do develop a calm mind through our own effort, this will last for only a minute or two before it changes. Developing a calm and peaceful mind for any length of time totally depends upon receiving blessings from Buddhas."