Molding of Character as I see It
A man's character is designed to some extent before he is born.The genes he inherits from his parents may play an important role in his character's molding after his birth.That is the biggest internal cause in my eyes.As to the external causes,we all know that a man's experiences have a great influence on his character,in other words our character take shape in the process of increase of our experiences.The two causes work together to mold a person's character,in which the external causes possess a larger percentage.So my conclusion is both the internal and external causes would affect a man's character but the after-birth experience and education decide most of it.