John Wesley emphasizes the character of Nathanael, whom Jesus called 'an Israelite indeed, in whom is no guile,' to illustrate the essence of true virtue, which he argues is rooted in the love of God rather than mere benevolence. He critiques contemporary thinkers like Hutcheson and Wollaston for separating love for God from love for neighbor, asserting that genuine virtue arises from a heart true to God, leading to sincere and truthful actions. Wesley insists that both truth and love must be united in a believer's life, as they reflect the character of Christ and fulfill the commandments of God. He encourages believers to seek happiness in God alone and to maintain sincerity and simplicity in their interactions with others.