Why should we think upon things that are lovely? Because thinking determines life. It is a common habit to blame life upon the environment. Environment modifies life but does not govern life. The soul is stronger than its surroundings.

This quote is pointing out that it’s not our environment that determines our life, but instead it is our thoughts that does. We are in control of our own lives and not the outside factors. It is suggesting that we should focus on thinking about positive, lovely things that bring us joy in life instead of focusing on the negative aspects of our lives. By having this positive attitude, it will help us to create the life we want, rather than letting our environment determine our life.