The biggest lesson from Africa was that life's joys come mostly from relationships and friendships not from material things. I saw time and again how much fun Africans had with their families and friends and on the sports fields they laughed all the time.
The learned are not agreed as to the time when the Gospel of John was written some dating it as early as the year 68 others as late as the year 98 but it is generally conceded to have been written after all the others.