Approaching Spiritual Master

Why one is unable to approach a genuine Sadhu or a spiritual master even after he has spent time most of his life in false attempt of enjoying this material world?

It is said that the living entities are wandering in the universe, in different species of life and out of those only a fortunate soul can receive the seed of devotion (bhakti) by the grace of Krishna and Guru. Especially in this age of Kali, where people in general are unfortunate and easily misguided, and where pure representatives of the Lord are so few, it is very rare to come in contact with a genuine spiritual master. It requires a sincere desire and genuine endeavor on our part to find a bona fide guru, and along with our endeavor it also requires the mercy of the Lord.