The look of an object will depend upon the medium through which the observer views it. In fact, our mental and intellectual conditions determine the object (three states), observed and experienced. The commoner viewing the world will see differently from a Gnani viewing the same world. Each one interprets the world that they see in terms of their existing knowledge. The commoner sees everything based on the ego therefore he sees the world in which he exists as a reality, whereas a Gnani sees everything as the consciousness and he is fully aware of the fact that, there is no second thing exists other than the Soul or the consciousness (subject). Thus, all the objective observation has to be bifurcated to realize the ultimate truth, which is beyond form, time, and space.
Only on the dualistic perspective the changes takes place. On nondualistic perspective, there are no changes. Those who believe in the dualistic world as a reality feels the knowledge changes time to time but they must realize their knowledge is limited to the form time and space whereas the Self-knowledge is the knowledge of the beyond the form, time, and space.
The change is possible only in ignorance. The ignorance is the cause of experiencing the world in which exist as a reality. The consciousness is the cause of the world in which we exists and it itself is uncaused.
The world in which we exist is dependent on the consciousness for its existence but the Soul, which is present in the form of the consciousness, is independent. On the standpoint of the Soul, the innermost Self, the world in which we exist is mere an illusion.
Only within the illusion the changes takes place, the illusory changes within the illusion is bound to be an illusion. In reality, the consciousness alone is real and eternal. Thus, the knowledge of the eternal will be always eternal. The intellectual knowledge based on the form, time and space is bound to change time to time as science progresses in its dualistic inventions.
The consciousness is ever changeless because it is formless, timeless and spaceless existence.
The individual is present only when the world is present. So, the individual exist within the world. On the standpoint of the Soul, the innermost Self, the world in mere a dualistic illusion created out of the Soul, which is present in the form of the consciousness.
There is no individual because there is no second thing exists, other than the consciousness because there is no duality in the reality.
The urge to realize the truth cannot be imposed, it has to sprout within. One need not search for a physical Guru because the Guru is within in to guide every seeker.
It is foolish to impose our idea on others because everyone is not on the same level of understanding. Everyone's inner work is on. When they are ripe enough they will understand, assimilate and realize on their own.
If they are ready and sharp enough they will grasp it instantly and they will reach their destination with lesser time and effort.