Psalm 19 shows us three truths about how God communicates with us, and how we can know him.
The spiritual wisdom that comes from God helps us to understand things that cannot be understood strictly in the natural realm. The really important issues of life, such as who is God, why did he create me, what is my purpose in life – are not found simply through “scientific” discovery. We must seek the spiritual wisdom from God via a relationship with him to understand these things.
Today's narrow understanding of “science” or “knowledge,” which only looks at what can be observed in the physical realm, is now equated with “truth,” and is considered by modern society to be more valuable than any other kind of knowledge. It has become the religion of modern man. But there is much knowledge in our world that cannot be observed in the physical realm, or “proven” by scientific discovery!
Very few things in life are determined as "true" strictly through the scientific method. Most of the time we rely upon credible testimony. There are many things we base our lives on today as truth that are not learned through scientific discovery. If you want to prove your birth, for example, you produce a birth certificate which is based on testimony, usually the testimony of a physician or person who helped your mother with your delivery. If you want to prove your marriage, you produce a marriage certificate, which is based on testimony, usually the testimony of the person officiating your wedding ceremony, etc. These are examples of the many things we hold true that can NOT be proven through scientific discovery.