It is okay for Christians to have material possessions like having a personal computer, a mobile phone, a nice house, a car and these are part of life's blessings. But do you know sometimes life's blessings can become a hindrance? Certain forces in the world can be used for good or for evil. Like the Internet can be used to spread God's Gospel and spread the truth but at the same time it can also be used to spread disinformation, cause trouble and spread heresies. Your personal computer could be used to do your important work but it can also be used to entertain one's sinful nature. A TV set can be used to watch the news but it can be used to watch ungodly TV programs.
Matthew Henry's advice is simple. With whatever you have do not let it come in between you and Christ. It is okay to get upset if you lost this and that but whenever something bad happens, it is possible that God is giving you chastisement because your eyes are not on him. When a person receives too much material blessing it is possible to keep one's eyes off God. Remember that Solomon soon went astray that God had to do some major chastising.
As Ecclesiastes writes, everything is vanity. He described how his materialism bored him and how God satisfied him. As Solomon warned his readers in Ecclesiastes 5:10, "He that loveth silver shall not be satisfied with silver; nor he that loveth abundance with increase: this is also vanity."