The Epistle to the Hebrews, although it does not bear his name, was traditionally considered Pauline (although Origen, Tertullian, and Hippolytus amongst others, questioned its authorship), but from the 16th century onwards opinion steadily moved against Pauline authorship and few scholars now ascribe it to Paul, mostly because it does not read like any of his other epistles in style and content. You will discover in-depth the truths contained in the book of Galatians.