“If God is slow in answering your request, or if you ask but do not promptly receive anything, do not be upset, for you are not wiser than God.”
“The ladder to the Kingdom is hidden within you, and within your soul. Dive down into your self, away from sin, and there you will find the steps by which you can ascend.”
“Make sure you see to small things, lest otherwise you may push aside important ones.”
And one of my favourites – because it challenges me:
“The knowledge of God does not reside in a body that loves comfort.”
The book is a mere 20 pages long but it is subject indexed and if you go through Amazon you can get it second hand next to nothing.