Proverbs 18:7 (NKJV)
According to the dictionary, the word "self-destruct" started being used in the late 1960s as a part of a television show where a secret agent would receive his assignment, and then the device that carried the message would "self-destruct". The device would destroy itself and then no one other than the specified secret agent would know what was said. No one had to do anything to stop the device from working, because the device had destroyed itself.
The Bible has a lot to say about our words. Proverbs 18:21 says that death and life are in the power of the tongue. Paul said in 2 Timothy 2:16-18 that the teaching of some was like cancer, and what was said overthrew some people's faith. James 3:4 compares our tongue, our words, to the rudder that guides a ship. Proverbs 18:7 says that a fool's mouth is his destruction, his lips are the snare of his soul. Words are much more important than we may have thought they were.
Some people, including Christians, would like to blame someone else for their problems, but the truth is that many people are simply self-destructing their own lives through their words. We need to learn what the Bible says about our life and say those things, and avoid saying things that are contrary to the Bible. We do not have to walk around quoting Bible verses, but we simply need to say the things about ourselves that we find in the Bible. By doing this, we will be setting our life on the right course and we can be sure that we will not self-destruct.