To comprehend the subtle spiritual truth, citta (memory) must be free from impurities and imbalances through the practice of meditation. Only in this way can one enter into the state of realization.
For the practice of yoga and meditation, there are three important requirements: a sense of morality; mind control; knowledge or intelligence.
Push yourself to sit in one position longer and practice meditation.
Practice your sadhana regularly as instructed. Remember one thing: Do not sit for meditation too long. Instead, sit a few times during the day. In addition, eat healthy food and do not overeat. If you do these things, surely you will have spiritual progress, for God loves the meek and the humble. He listens to them.
Even highly advanced yogis can become the victims of ego. For this reason one must develop devotion to the Lord, along with the practice of meditation, to eliminate any downfall.