Most of the ones who are successful and who enjoy the religious life share several important traits. One of these is patience. It s also important for people in religious life to be friendly and approachable. Jesus was friendly to all he met, both the poor people and wealthy tax collectors. I believe he looks for the same trait in those he calls to follow him through vocations.
Obedience is another important trait.
Last, a person should be willing to join the religious life. Someone who only became a priest or sister because of pressure from family or friends will not be as happy in vocations as someone who feels truly called to religious life. Even though the unwilling person may later be fine living as a priest or nun, they might always wonder if God had some other plan for them. This isn t to say that only those who are deeply religious and pray constantly are the only ones who should join vocations. God calls all different kinds of people to serve Him as priests, sisters, and brothers.