The first part of chapter 15 focuses on two experiences: divine goodness, faithfulness, patience, and mercy (1; Ex 34:6f), and the understanding that knowing God is equivalent to recognizing perfect justice or the principle of immortality (3; Jn 17:3). Knowing God is an experience. It is a complete experience even here on earth because He is good, faithful, patient, and merciful. This is how He shows His strength and justice.