You must ask for God's help. Even when you have done so, it may seem to you for a long time that no help, or less help than you need, is being given. Never mind. After each failure, ask forgiveness, pick yourself up, and try again. Very often what God first helps us towards is not the virtue itself but just this power of always trying again.
When a man has calamity upon calamity the world generally concludes that he must be a very wicked man to deserve them. Perhaps the world is right; but it is also just possible that the world. . . may be wrong.