Kogun funtou 孤軍奮闘 To fight alone
In the end, nobody really exists but you. In philosophy this idea that no other mind exists is called Solipsism. I'm not trying to get all nihilistic here nor am I speaking about oneness in a narcissistic sense but what this idiom means is that when it comes down to it we are alone in our efforts. No one is coming to save us or going to make us better - it is solely our job to get it done.
Training in the martial arts is a solitary pursuit. We are influenced by our classmates and our teachers, but the improvements we acquire are ours alone and with that being said solely under our own power. Rarely can anyone provoke us to get out of bed or off the couch and go to class. Most times, we make an active choice to improve our lives by going out and pursuing that thing that we want.
There is an African saying, "If you want to go fast, go alone. If you want to go far, go together." Kogun funtou is the first part of this saying in that to get what we want we must do it under our own power. However, true change and lasting tranquility is only acquired when we share ourselves with other people. In other words, it is only when another human being enters into our world is humanity truly created. It is the same with art - it only becomes "art" when it is shared with the world.
In Aikido, this is where we come to understand the interdependent cycle of humanity. We cannot improve if we don't do it under our own power, but man cannot evolve unless we share ourselves with others.