“Happy and strong” comes from sukkha & sthira. Sukkha is the opposite of dukkha = suffering, pain, dissatisfaction. So maybe sukha is “content”. Sthira is steady or strong. You are here for a purpose. What is your purpose? Stay true to it. Clarify it. Believe it is possible. An optimistic wise person questions their beliefs. A fearful person doubles down. Don’t be afraid, be good.