Here are a list of powerful speakers on religious/life topics. I am biased .. and these are people who have influenced me .. It gives you an introduction to many of my favourite teachers. You can then search for their books and other talks on You-Tube and other sources on the internet. Blessings ...
Joan Chittister Gift of Art
Joan Chittister Monastery of the heart
Frank Moloney Gratitude
Joan Chittister on Peace
Richard Rhor What did Jesus Teach?
Richard Rhor The New Mind - Contemplative Mind
Ronald Rholheiser Passion of Christ
Rob Bell NOOMA series (here is one on wealth) Rich | 013
Joyce Rupp Interview: 365 Names of God
Eckhart Tolle Not reacting to Content
Ken Wilber Science and Spirituality (heavy intellectual content)
Tony Robbins: Why we do what we do ...(6 human needs)