7 Possible Obstacles to Our Sanctification:
1. Mortal sin
2. Deliberate venial sins
3. A lack of generosity in pursuing God's will and uniting our will to His.
4. Lack of bodily mortification.
5. Lack of interior mortification.
6. Lack of spiritual reading.
7. Lack of mental prayer.
"All the saints became saints because of mental prayer."