When we talk about the concept of using what we know, and applying the wisdom we gained from so much study and reflection, we're talking about action—that is, what we actually do. There seems to be a contemporary concept that in living the best way I can, I am doing all I can. In being the best person I can be, I am doing what I can. That is true, if we're talking about the beginning of the process, not the end.
The idea that "we're all in this together" has taken a beating in recent years. It is directly contrary to the prevailing political views of our time, which are all about being rich, getting richer, laws that favor only the extremely wealthy, and elections determined more and more by money rather than issues. This is largely on the political level, but applying the holistic principle, we can see that politics is a method of organizing not just society but also thought and the frameworks of ideas—that is, the ideas that make up who we think we are, and therefore how we should act on any given day.
Using what you know is the same as the spirit of service. That might be in service of what actually makes sense for you personally, or what makes sense for you to do within a wider concept of your environment. It means not pretending to not know what you do know, i.e., recognizing the problem with denial. The fact that denial is such a popular mental habit does not mean that it's good for you or for anyone else.
But it takes real focus and intention to come out of denial (and dealing with what you denied). You might say that's the whole purpose of spiritual training, of therapy, of community work, of political participation, of nearly anything that requires you to say to yourself, "Yes, I get it," and to the take the next step of doing what makes sense in the context of knowing; of getting it.
I would propose here and now that a great deal of the pain or discomfort or fear or depression that you may experience from time to time, or often, could be resolved by "getting it" and doing what makes sense in that context.
The 1960s were an extraordinary time in history. I don't want to romanticize them but there was, in fact, a spirit of awakening and of action and participation. The notions that we're all in this together and that we share a common space, and doing something with what we know, were more widely practiced. The essence of 1960s astrology involved Virgo and Pisces. There were many breakthroughs in that era, and in some ways we are still riding on its coattails. I think the most significant experience of that era was the actual sensation that we're all in this together.
We still are. And the idea that we are has never counted for more than it does today. It may be easy to live in a bubble, but I assure you, it's lonely, and eventually you'll run out of air. Meanwhile, it's very likely you know exactly what to do, because you're called to do it every day.