Professor Albert is a 60 year-old professor in computer science. He gets up at 7 am and takes a walk through the local park for an hour. He is at his university at 9 am teaching his advanced course in computer science. He concludes each lecture with the words, “Students, you are the joy of my life. If anyone needs assistance, please see me in my office from 4 pm to 5:30 pm. You’re dismissed”. He goes to lunch around 12 pm. He gives a call to his son around 1 pm, asking him how he is doing and how life is treating him. From 4 pm to 5:30 pm, he works with students who need extra help in their classes. He ends his day with dinner with his wife around 6 pm. Which of the following virtues has he achieved during this stage of development in Erikson’s stages of psychosocial development?