You have to make an enormous effort to realize the Self. It is very easy to stop on the way and fall back into ignorance. At any moment you can fall back. You have to make a strong determined effort to remain on the peak when you first reach it, but eventually a time will come when you are fully established in the Self. When that happens, you cannot fall. You must have a lifelong commitment to establish yourself in the self. Your determination to succeed must be strong and firm, and it should manifest as continuous, not part-time, effort. For many lifetimes you have been immersed in ignorance. You are habituated to it. All your deeply rooted beliefs, all your patterns of behavior reinforce ignorance and strengthen the hold it has over you. This ignorance is so strong, so deeply enmeshed in all your psychological structures, it takes a massive effort over a long period of time to break free from it. The habits and beliefs that sustain it have to be challenged again and again.