I read "Seven Storey Mountain" and this book together. Brilliant. "New Seeds" is a necessary book for the more mature Christian who is now seeking a deeper life un God. Milton is not a systematic theologian. He is a mystic and he guide you through the do's and don't's of pursuing a contemplative life.
His writing is crisp and pithy. He is a journalist after all!. I am now reading other books by Milton.