Paraphrase this quote: “The happiness of our life depends upon the quality of your thoughts: Therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature.'' Marcus Aerelius
Being happy in what we do in our everyday lives is dependent on the goodness and truthfulness in our thoughts. Do not think of or contemplate dishonest or sinful things; and scrutinize your mind to make sure you do not do this.