➝ The Main Three Paths to Walk — Truth is the Cause and Power is the Effects
Truth and Power are basically the two things motivating all actions of all beings, but the way they relate to these two things varies a lot, which determines which path they are on at the moment. Truth is the cause, and Power is the effects.
➝ Seeking only Power : The Dark Path
Beings who seek only power without any regards and care for the Truth serve the dark. They only want satisfaction based on lower planes, physical etc, without any care for the higher truths which are the basis for the lower planes. They may seek knowledge, for example occult knowledge, but they have no regards for the real Truth behind the knowledge, they only want to use it for personal power. They may not be part of dark forces officially, but they serve the dark agendas one way ot the other.
➝ Truth in service of Power : The Grey Path
Many beings realize, in some way or another, that to know the Truth is ultimately the Source of all power. So they seek to know some Truth, but more or less just to give themselves more Power. Here there are many variations and different paths, different nuances of grey, from darker to Lighter, depending on how much the focus is on Truth or Power. Some people may have various amounts of Truth, and they use it for various other purpose : political power, occult or psychic power, fame and recognition, power over others, financial and carreer, etc
It may appear on the surface that they serve Truth and Light, and many of their actions may really serve the Light, but they can serve both dark and Light at different moments, more or less without realizing it themselves. For example they may care more about personal enlightenment despite of the interests of healing all of creation, not realizing that they are a part of the whole. The underlying reason for this is various fears, traumas, fear of survival, etc, which push people to try and compensate, to save themselves. Deep down it is not really their main concern to know if they serve dark or Light, no matter what they tell others and themselves, what they care most about deep down is their other aims.
➝ Seeking Truth, Power in service of Truth : The Light Path.
This is the only path which is really towards the Light. All power is readily placed in service of Truth, regardless of various other personal interests. There is a willingness to make tough choices which may not serve personal interests at least in the short term, if it will benefit the advancement of Truth. Truth in the end is what will serve all the most, because the highest Truth is Oneness, Love and Peace, so that is what is served, the Love and Peace for all beings as One, as much as possible.
This doesn't mean to reject Power, on the contrary, the more Truth there is, the more Power will be available, because Power is only an effect of Truth. But all greater Powers will be placed in service of the Truth which created them.