1. 觀身不淨 guān shēn bú jìng
2. 觀受是苦 guān shòu shì kǔ
3. 觀心無常 guān xīn wú cháng
4. 觀法無我 guān fǎ wú wǒ

1. Contemplate the impurities of the body;
2. Contemplate the suffering of feelings;
3. Contemplate the impermanence of the mind;
4. Contemplate the non-selfhood of phenomena