Do nothing out of selfish ambition or vain conceit. Rather, in humility value others above yourselves (NIV)

Do nothing from factional motives [through contentiousness, strife, selfishness, or for unworthy ends] or prompted by conceit and empty arrogance. Instead, in the true spirit of humility (lowliness of mind) let each regard the others as better than and superior to himself [thinking more highly of one another than you do of yourselves]. (AMP)

Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves. (KJV)