I have read various articles about discerning a vocation, lists of "signs" that one is called, etc. Examples of such signs are desiring a deep relationship with Christ, wishing to help people and build up the Church, being willing to offer one's self for Christ, etc...
In other words, qualities which every zealous, devout Catholic ought to have!
Sometimes it even seems as though, if one is a devout, holy Catholic, one probably has a calling --- so....married people are supposed to just be the weaker ones who can't practice great virtue?
For instance, I was recently talking with a friend of mine who related a story about St. Alphonsus Liguori to me, in which St. Alphonsus told a man that, since he was able to control himself sexually, he should become a religious. This makes me want to become a priest all the LESS!