opportunity is offered to a person who is sincere

The Nectar of Instruction 3
His Grace A.C.Bhaktivedanta Swami

The material world is a place of confinement for the living entities who are by nature ānandamaya, pleasure-seeking. They actually want to be free from the confinement of this world of conditional happiness, but not knowing the process of liberation, they are bound to transmigrate from one species of life to another and from one planet to another. In this way the living entities are wandering throughout the material universe. When by good fortune one comes in contact with a pure devotee and hears from him patiently, one begins to follow the path of devotional service. Such an opportunity is offered to a person who is sincere.

…Furthermore, in order to be successful in devotional service one must give up the association of undesirable people