4 There is one body and one Spirit—just as you were called to the one hope that belongs to your call— 5 one Lord, one faith, one baptism, 6 one God and Father of all, who is over all and through all and in all.
13 until we all attain to the unity of the faith and of the knowledge of the Son of God, to mature manhood, to the measure of the stature of the fullness of Christ, 14 so that we may no longer be children, tossed to and fro by the waves and carried about by every wind of doctrine, by human cunning, by craftiness in deceitful schemes. 15 Rather, speaking the truth in love, we are to grow up in every way into him who is the head, into Christ, 16 from whom the whole body, joined and held together by every joint with which it is equipped, when each part is working properly, makes the body grow so that it builds itself up in love.
John 13:35 By this all people will know that you are my disciples, if you have love for one another. (My pastor preached an excellent sermon on this verse last Sunday. You can listen here.)
7 Beloved, let us love one another, for love is from God, and whoever loves has been born of God and knows God. 8 Anyone who does not love does not know God, because God is love. 9 In this the love of God was made manifest among us, that God sent his only Son into the world, so that we might live through him…. 19 We love because he first loved us. 20 If anyone says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen cannot love God whom he has not seen. 21 And this commandment we have from him: whoever loves God must also love his brother.
Thank God there are those in the contemporary church who are determined at all costs to defend and uphold God’s revealed truth. But sometimes they are conspicuously lacking in love. When they think they smell heresy, their nose begins to twitch, their muscles ripple, and the light of battle enters their eye. They seem to enjoy nothing more than a fight. Others make the opposite mistake. They are determined at all costs to maintain and exhibit brotherly love, but in order to do so are prepared even to sacrifice the central truths of revelation. Both these tendencies are unbalanced and unbiblical. Truth becomes hard if it is not softened by love; love becomes soft if it is not strengthened by truth. The apostle call us to hold the two together, which should not be difficult for Spirit-filled believers, since the Holy Spirit is himself ‘the Spirit of truth’ (John 14:17), and his firstfruit is “love” (Galatians 5:22). There is no other route than this to a fully mature Christian unity (p. 172).