習氣 (xí qì ) means habitual tendencies, subtle inclinations that are imprinted in the mind, like a stain. We often don’t pay much attention to it. What is worst, we may even think of all these as “just the way we are”. These tendencies live in a more or less unconscious corner of our mind. Self-reflection can help you change your bad habitual tendencies.
The greatest of our habitual tendencies caused by delusion is that we only see the mistakes of others, but seldom reflect on the shortcomings of our own.