What saints were able to accurately determine what vocation God is calling someone to?

Saints sometimes exhibited mystical phenomena in the cognoscitive order such as visions, locutions, revelations, discernment of spirits , and hierognosis (ability to distinguish blessed from profane objects); cf. Antonio Royo Marín, O.P., *Teología de la Perfección Cristiana* p. 814. Discernment of spirits in the sense of reading souls (as opposed to distinguishing good from evil spirits; cf. *ibid.* p. 826) would seem to include the ability to know what state of life God is calling a particular soul to. What saints gifted with spiritual discernment were able to accurately determine what vocation God is calling someone to?