In Galatians chapters 1-2, Paul makes a theme of the concept of partiality and the truth of the gospel. His point with those 2 subjects is driven home in 2:11-21, where he rebukes Peter seemingly on the issue that if you have partiality mixed up in the matters of your heart, the truth of the gospel is bound to get mixed up as well. Maybe Paul's point is that the whole point of the gospel, alongside God's determination in His love for us in giving Jesus to die for us, is His impartiality.
John 3:16 For God so loved the world that He gave His only begotten Son, that whoever belives in Him should not perish but have everlasting life.
My favorite thing about the Bible's theme of God's impartiality is that it makes it clear that there may be humans that are better in some ways than other humans but God's character is so strong that He is not moved except by His love for the whole of humanity that He created. No matter how much more wise and discerning Solomon was than any other human, God did not love him more. And no matter how much greater John the Baptist was, God did not love Him more.
1 Kings 3:12 behold, I now do according to your word. Behold, I give you a wise and discerning mind, so that none like you has been before you and none like you shall arise after you.
For John the Baptist:
Matthew 11:11 Truly, I say to you, among those born of women there has arisen no one greater than John the Baptist. Yet the one who is least in the kingdom of heaven is greater than he.
What does this mean? That God is not going to be more or less patient and kind with certain people than with others. If His love bears all things, believes all things, hopes all things, and endures all things, then we can know that God will carry out His loving nature without prejudice to whomever He wills.
Obviously the first encouragement for believers in God's impartiality is that He is not going to love someone else more than He loves us, and the humbling opposite that God does not love us more than He loves anyone else. But also that when we are confronted with a neighbor, a stranger in the grocery store, or sitting by a stranger in an airplane we don't have to wonder if God loves them and wants us to share the gospel with them because He is impartial and absolutely wants us to share the gospel with them.
Acts 10:34-36 So Peter opened his mouth and said: “Truly I understand that God shows no partiality, but in every nation anyone who fears Him and does what is right is acceptable to Him. As for the word that He sent to Israel, preaching good news of peace through Jesus Christ (He is Lord of all),"
So remember that God's love extends to you, and to all of humanity, so much that He sent His Son to die for us. As God has not shown partiality in His love to man, neither should we. We should love and preach the gospel to all people!