2. In Greece, a boy was under his father's care from seven until he was eighteen. He then became what was called a "cadet," and for the next two years he was under the direction of the state. His long hair was cut off and offered to the gods. Growing up was quite a definite process.
3. Under Roman law, a boy came of age between the ages of fourteen and seventeen. At a sacred festival, he took off the boy's toga, which was a toga with a narrow purple band at the foot and put on the man's toga. He was then conducted by his friends and relations down to the forum and formally introduced to public life. On the day a boy or girl grew up, the boy offered his toy, and the girl her doll, to Apollo to show that they had put away childish things.
The proof that we are adult Christian sons and daughters of God comes from the instinctive cry of our hearts. In our deepest need we cry, "Abba, Father!" to God or "Daddy, Daddy!" "Because you are sons," says Paul, "God sent the Spirit of his Son into our hearts, the Spirit who calls out, "Abba, Father.""