I just wanted to share a discernment exercise that I read in To Save a Thousand Souls.
Fr. Brett A. Brannen once had a spiritual director, who was a Trappist monk. He suggested a very creative exercise to discern the Lord's will. This exercise is called the "What Can I Live Without?" exercise. Basically, on two consecutive days for one hour, you create a "holy fantasy" of marriage and priesthood. One day and one hour for marriage, and one day and one hour for priesthood. After this exercise, you realize what you can live without. If you can live without either marriage or priesthood, then the other is likely your vocation.
Fr. Brett did as the Trappist monk suggested. He imagined the trials and joys of marriage and realized that there is nothing wrong with marriage. The next day he fantasized about the life of a priest. Once the discernment exercise was completed, he felt that he had gone no where with it; however, he remembered that the Trappist monk told him that he needs to realize which vocation he can live without. This was hard, however, because Fr. Brett felt attracted to both vocations.
Fr. Brett then began to reason that if he got married and had a family, he would never become a priest. He would never celebrate Mass and feed people with the Eucharist, hear Confessions and cleanse people of their sins, and people would never call him "Father." This sent a sword through his soul, and the case was pretty much closed with that.
Which can you live without?