To add on to the previous post, I saw this paragraph on Gampopo's teaching about the guru's blessing from another website.
The kind teacher is the Buddha in person and if you have uncontrived faith and devotion, it is impossible that the power of blessings will not arise. If you are not a suitable object of blessings, you will not receive experience and realization, like a seed that does not sprout. Enlightenment is the result of inner experience, not dry intellectual understanding. In brief, if your mind stream and dharma are separate, you are merely the semblance of a dharma practitioner and you will not achieve your aim.
|Lama Zopa Rinpoche listening to a student's queries|