You can lose your job, you can lose material items, but you can never lose your knowledge. The money and time we invest in ourselves to further increase our knowledge is truly an investment in our future.
Make sure you are not worrying about daily stresses of life, such as bills, work, family this can influence how you think. Take time for yourself and create a strategy for the things that are taking away your peace. Making a plan ahead instead of worrying can make you better cope with everything you are going through.
How you think is influenced by what you read, what you listen to. Reading books that have a positive influence on your thinking can truly change your life. 
Life is meant to be lived, to explore, to learn and to share. Sharing your knowledge is one of the greatest gifts a person can give. And, as you teach, you will find yourself learning.
One of my favorite book is the Bible. There are so many life lessons to be learned in this book. What is yours?