Buddhist psychology.

Buddhist psychology enumerates six fundamental delusions, which frustrate and disturb the peace of the human mind and cause it to become restless: attachment, anger, ignorance, pride, deluded doubt and holding distorted views. These are mental, not external phenomena. So, when Lord Buddha taught people how to overcome these delusions, he emphasized the necessity of understanding their nature, not simply belief and faith. Without investigating your mind and developing introspective knowledge-wisdom it is not possible to develop such understanding. 

~ Lama Thubten Yeshe

The Mind Is Like Space

The essential nature of the mind is like space. There is no such thing as a mind that truly exists or a mind that is inherently established even though we might find reasonings, scriptures, or experience to the contrary. Mind is empty. Our ordinary mind, however, becomes confused in thinking that things really exist. The nature of our mind is emptiness, but not a blankness, not the result of mere negation: emptiness is also radiant clarity, the basis for the appearances of both samsara and nirvana. The mind is like space and it also has a clear and knowing aspect, which allows us to say, “This is space.” Resting in mind’s empty, clear nature, we will be at ease as we move along the path of practice.

~ 17th Karmapa

Your mind, is your responsibility.

The teachings, the philosophies, the explanations of the Buddhist path really doesn't have any worth at all. The worth is all contained in the experiencing... Experience means that you can actually see and comprehend the teachings in your own mind. You must put the path into practice for yourself to receive any benefit. So please don't be lazy, thinking that someone outside of you is going to save your butt. Your mind, is your responsibility.

~ Phakchok Rinpoche

Mind is empty

Mind is empty, and while being empty, it still knows or experiences. Space is empty and does not know anything. That is the difference between space and mind. Mind is similar to space in that it is insub­stantial, not material. Isn’t it quite amazing that some­thing that is insubstantial is also able to experience?

There is mind, but it is not tangible or substantial. You cannot say that there is no mind because it is the basis of everything; it is that which experiences every possible thing. You cannot say really that there is a thing called mind, and yet at the same time you can­not say that there is no mind. It lies beyond both extremes of being and not being. That is why it is said, "Not existent, since even a buddha does not see it; not nonexistent, since it is the basis of both samsara and nirvana."

~ Tulku Urgyen Rinpoche