Philippians 2:3 Do nothing from selfish ambition or conceit, but in humility count others more significant than yourselves.
Is it selfishness or conceit? That is according to the ESV.
Philippians 2:3 King James Version
Let nothing be done through strife or vainglory;
In the KJV the word selfish is not used and conceit is vainglory.
Perhaps the either or should be either the ESV or KJV?
Translations came about because English is a confusing language that changes over time because dictionaries list how words are used by society and society changes from generation to generation.
But the nature of man does not change.
Proverbs 3:5 Trust in the Lord with all thine heart; and lean not unto thine own understanding.
Proverbs 3:5 Trust in the Lord with all your heart, and do not lean on your own understanding.
Both versions agree where our trust must rest.
Whatever version we choose to use, the goal is to understand the mind of Christ.
1 Corinthians 2:16 “For who has understood the mind of the Lord so as to instruct him?” But we have the mind of Christ.