"If you start any large theory, such as quantum mechanics, plate tectonics, evolution, it takes about 40 years for mainstream science to come around. Gaia has been going for only 30 years or so"

This quote by James Lovelock is describing the acceptance of new scientific theories. He is recommending that it takes a very long time for mainstream science to accept brand-new theories, which it is just after a duration of 40 years that these theories end up being accepted. He is also describing his own theory of Gaia, which he proposed 30 years back. He is suggesting that it will take another 10 years for Gaia to end up being accepted by mainstream science. This quote highlights the difficulty of introducing new clinical theories, and the quantity of time it takes for them to be accepted. It likewise serves as a tip of the importance of determination and devotion when introducing new theories, as it may take a very long time for them to be accepted.