Thoughts—thousands of them! All day they flow through the human mind in a constant stream. We are fully conscious of some of them, but of others we are not.
Is this all there is to thinking? No. We can choose what kind of thoughts we shall entertain. Even though at times it may seem difficult to be selective, we do have this power. We can decide whether to harbor good or bad thoughts.
We can accept the spiritual, good ones that come from the divine Mind and reject the depraved ones that are the product of mortal mind. And since our thoughts determine our outward human experience, thinking is the most important thing we do. If we're wise, we shall learn to do it as well as we can.