一己之私

yījǐzhīsī

one's own selfish interests

Wiktionary

Entry Composition

1 一己 yījǐ oneself
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
3 私 sī
  1. personal
  2. private
  3. selfish