What does James mean by "Show no partiality?"

Is it relevant for today?

It is stunning how applicable this passage is to contemporary society!

Praise the LORD! Praise the LORD from the heavens; Praise Him in the heights! Praise Him, all His angels; Praise Him, all His hosts! Praise Him, sun and moon; Praise Him, all you stars of light! Praise Him, you heavens of heavens, And you waters above the heavens! Let them praise the name of the LORD, For He commanded and they were created. He also established them forever and ever; He made a decree which shall not pass away. Praise the LORD from the earth, You great sea creatures and all the depths; Fire and hail, snow and clouds; Stormy wind, fulfilling His word; Mountains and all hills; Fruitful trees and all cedars; Beasts and all cattle; Creeping things and flying fowl; Kings of the earth and all peoples; Princes and all judges of the earth; Both young men and maidens; Old men and children. Let them praise the name of the LORD, For His name alone is exalted; His glory [is] above the earth and heaven. And He has exalted the horn of His people, The praise of all His saints--Of the children of Israel, A people near to Him. Praise the LORD! (Psalm 148:1-14 NKJV)

For the Chief Musician. A Psalm of David. O LORD, You have searched me and known [me]. You know my sitting down and my rising up; You understand my thought afar off. You comprehend my path and my lying down, And are acquainted with all my ways. For [there is] not a word on my tongue, [But] behold, O LORD, You know it altogether. You have hedged me behind and before, And laid Your hand upon me. [Such] knowledge [is] too wonderful for me; It is high, I cannot [attain] it. Where can I go from Your Spirit? Or where can I flee from Your presence? If I ascend into heaven, You [are] there; If I make my bed in hell, behold, You [are there]. [If] I take the wings of the morning, [And] dwell in the uttermost parts of the sea, Even there Your hand shall lead me, And Your right hand shall hold me. If I say, "Surely the darkness shall fall on me," Even the night shall be light about me; Indeed, the darkness shall not hide from You, But the night shines as the day; The darkness and the light [are] both alike [to You]. For You formed my inward parts; You covered me in my mother's womb. I will praise You, for I am fearfully [and] wonderfully made; Marvelous are Your works, And [that] my soul knows very well. My frame was not hidden from You, When I was made in secret, [And] skillfully wrought in the lowest parts of the earth. Your eyes saw my substance, being yet unformed. And in Your book they all were written, The days fashioned for me, When [as yet there were] none of them. How precious also are Your thoughts to me, O God! How great is the sum of them! [If] I should count them, they would be more in number than the sand; When I awake, I am still with You. Oh, that You would slay the wicked, O God! Depart from me, therefore, you bloodthirsty men. For they speak against You wickedly; Your enemies take [Your name] in vain. Do I not hate them, O LORD, who hate You? And do I not loathe those who rise up against You? I hate them with perfect hatred; I count them my enemies. Search me, O God, and know my heart; Try me, and know my anxieties; And see if [there is any] wicked way in me, And lead me in the way everlasting. (Psalm 139:1-24 NKJV)