Charles H. Spurgeon on Psalms 138:5

Yea, they shall sing in the ways of the LORD. Walking with God is a pleasant walk: the ways of wisdom are called "ways of pleasantness": Pr 3:17. Is not the light pleasant Ps 89:15: "They shall walk, O LORD, in the light of thy countenance." Walking with God is like walking among beds of spices, which send forth a fragrant perfume. This is it which brings peace, Ac 9:31: "Walking in the fear of the Lord, and in the comfort of the Holy Ghost." While we walk with God, what sweet music doth the bird of conscience make in our breast! "They shall sing in the ways of the Lord." —Thomas Watson.