The obstacles to development in spirit life have their root in earth life

Samuel Bowles recounts the story of the two brothers. As he bids the brother goodbye, Samuel Bowles thinks – 

All those whom he directly wronged are now in spirit life and have forgiven him but he cannot forgive himself. This is slow Hell!

Remember – 

True strength lies in forgiveness.

In his rambles, Samuel Bowles meets a great student of the law. He asks him – What are you doing with your knowledge?  The other answers – Oh! I'm storing up, storing up, all of the time. I don't intend anyone to get ahead of me.

Remember – 

Let your bestowing love and your knowledge be devoted to be the meaning of the earth! 

Zarathustra I:22. The Bestowing Virtue 

Of obstacles to development in spirit life, Samuel Bowles writes that he understands enough to make him speak in thunderous tones to those who are in earth life –

Lay down all idols, for you will find them to be clay. Break all conditions of habit, whether of body or mind, which will serve as a hindrance to rapid progress in spirit life.