In 1994 , he started Desiring God Ministries . Today Desiring God puts all of Piper 's sermons and articles from the last three decades online for free , as well as offering books , CDs , and DVDs . In 1994 , he founded Desiring God Ministries , which today provides all of Piper 's sermons and articles from the past three decades , and most of his books online free of charge , as well as offering for sale books , CDs , and DVDs and regularly hosting conferences .