Sins of self are multi-faceted.
Self-confidence: Generally, people assume self-confidence is good. For disciples, self-confidence disconnected from God-confidence could be disastrous. The Nation of Israel was self-confident, indeed over-confident after defeating Jericho and thought Ai is like kids’ play. They were defeated. (Joshua 7:1-26)
Self-seeking: Baruch the penman of Jeremiah, was an educated man and his brother served as an officer under King Zedekiah. (Jeremiah 51:59) Jeremiah and Baruch were taken to Egypt against their will. Lord warned him, not to seek. (Jeremiah 45:8) Paul warns not to think highly of oneself. (Romans 12:3)
Self-indulgence: The rich man was not bothered about the poor at his gates. One proverb: Out of sight, out of mind. But poor Lazarus was visible, yet the rich man tried to put him off his mind and was indulging in luxury including sumptuous food. (Luke 16:19-31)
Self-love: Paul writes that in the Last Days, people will be lovers of self. (I Timothy 3:1-5) Nowadays people like to feel good about themselves.
Self-obsessed: Those who are obsessed with pleasure will end up in poverty. (Proverbs 21:17) There are people interested in themselves, their growth, and progress and do not care if others suffer or lose. (Philippians 2:4)
Self-pity: Martha was overwhelmed by serving and was envious of her sibling. Martha thought she was pitiable as all things come upon her, while Mary was carefree. However, Lord Jesus helped her to understand what should be the priority choice, sitting and listening to the Lord. (Luke 10:38-42)
Selfish ambition: Having ambition in life is good, better if it is according to God’s will. However, selfish ambition is dangerous. (James 3:14-15) If a young person has the ambition to serve people by becoming a medical doctor, it is good. If the young person wants to become a doctor to earn money, create wealth, and become great, then that is a dangerous selfish ambition.
Self-gratification: Many want to indulge in their desires and ignore others’ needs. (Romans 2:8)
Self-worship: Post-modern generation is obsessed with their own body, indeed worshiping their own bodies.
Do I place myself as a living sacrifice on the altar? (Romans 12:1)