"The inner refuge is Lama, Yidam and Khandro/Pawo. Usually when we speak of refuge, in the Tibetan system we talk about a fourfold refuge which is Lama, Buddha, Dharma, Sangha; this is a hybrid between the outer and the inner refuge. Lama is always put there first because without the Lama, Buddha, Dharma and Sangha do not exist. This is because someone has to exemplify the path. A path is all well and good; but if you cannot see anyone who has lived that, if you cannot see anyone who in some way exemplifies the fruit of that path, then what inspiration is there?"
Compassion & The Nine Yanas, Ngak'chang Rinpoche, Aro Encyclopaedia