Last summer I wrote two booklets for the TAN series, Classics Made Simple. Go here to see the one on Abandonment to Divine Providence by deCaussade, and go here for the one on St Francis de Sales An Introduction to the Devout Life.
I can highly recommend this series–(not just because I wrote two of them) but because they are an example of one of our good, solid Catholic publishers making a great effort to renovate and renew the classics of Catholic spirituality.
If more Catholics were aware of the riches of our own spiritual tradition fewer would go trotting off to explore wacky New Age junk. I remember meeting a lapsed Catholic in England who had been bilked of a pile of money by some guru woman who taught her and her husband to meditate, and then asked for lots of loot to open up a retreat center. The woman got burned, and when I asked her why she went in for such stuff she said she was searching because she had never found what she was looking for in her Catholic faith.
What? No meditation? No contemplative prayer? No personal search for holiness? Apparently not. She thought it was just about pray, pay and obey and turn up for Mass on Sunday.
So, learn about the depths of your faith, and start with the classics.