The days on the ship passed in a constant cycle of Cassian begging Cassandra to let him into her room, but she remained firm, only coming out to eat and always shooing him away. During this time, Cassian learned a lot about meditation.
At first, he thought simply falling asleep while meditating counted as progress. He quickly learned that it didn't. Even keeping his eyes closed but still lost in thoughts didn't qualify. Sitting still wasn't enough either. It wasn't until the last day that he truly grasped what meditation was about.
By accident, he cleared his mind of everything, leaving it focused solely on his sword—its essence, its technique. In that moment, he finally understood the real purpose of meditation.