Whensoever thou wilt rejoice thyself, think and meditate upon those good parts and especial gifts, which thou hast observed in any of them that live with thee: as industry in one, in another modesty, in another bountifulness, in another some other thing. For nothing can so much rejoice thee, as the resemblances and parallels of several virtues, eminent in the dispositions of them that live with thee, especially when all at once, as it were, they represent themselves unto thee. See therefore, that thou have them always in a readiness.
When you want to cheer yourself up, reflect on the positive qualities and unique talents you've noticed in those around you. Consider one person's work ethic, another's humility, someone else's generosity, and so on. Nothing can bring you more joy than recognizing the various virtues displayed by the people in your life, especially when you consider them all at once. Keep these observations in mind, ready to recall whenever you need a boost.