Far too many people have forsaken the simplicity which is in Christ and have instead pursued the complexity and labour of religion (2 Corinthians 11:3).
Paul was one of the most religious people ever to live. In spite of his religious efforts, he was condemned to hell until he trusted Christ as Saviour.
Some believers err on the side of laziness while other believers err on the side of taking no rest. Both can be life threatening in one’s walk with God.