The saints were real people like you and I. The only difference is that they sought Almighty God with their whole heart, soul, mind, body and strength. And yet they ran into the same difficulties as we do. They had to deal with day to day problems and affairs. Through their letters we can learn a lot about their character and how they dealt with the day to day problems of every day life. And consider Saint Alphonsus founded a congregation and then was made Bishop of a Diocese. He lived to a very old age, which means he was dealing with many things for decades.
Saint Alphonsus Maria de Ligouri, Brother Hermenegild TOSF, Paperback, ISBN 10: 1495367452, ISBN 13: 9781495367458