Thomas had been confused by one priest stalling his call to the priesthood once he had told him the particulars of his life, for there had been some notable experiences that did not become a priest, like fathering a child while a student at Cambridge.
A line from a graduate school reading of mine states "Transitions are dangerous by their very nature for you are neither here nor there." So, hearing one priest hesitate to welcome him immediately into one order, derailed his movement into the priesthood for years.
I have a very close friend who has suffered so. I suppose it is not unusual, for transitions are moments of potential confusion. Follow the subtle leading of the Spirit into clarity of mind then leap into the choice we want to make. Leap into freedom of heart, mind and soul.