Obstinacy is one of the main requirements if you are to serve God.  Understand this well.  Every person who wishes to enter the service of God, even the most insignificant of men, will inevitably have to endure innumerable ups and downs.  He will find himself thrown down and cast aside in every conceivable way.  To endure all this takes endless fortitude.  At times the only way to strengthen yourself is with sheer obstinacy.  Nothing is more vital than this obsitinacy.  Remember this well, for you will certainly need it in your quest. ~ R’ Nachman of Breslov zt”l