Rom 12:3  "For by the grace given to me I say to everyone among you not to think of himself more highly than he ought to think, but to think with sober judgment, each according to the measure of faith that God has assigned." 

One of the greatest dangers in life is being dis-satisfied with what God has given you, how you were put together or that your not like or don't have what others around you have. 
This leads to irrationality, a kind of unrealistic expectation and obsession. A step away from faith to folly.

Rom 12:4,5  "For as in one body we have many members, and the members do not all have the same function, so we, though many, are one body in Christ, and individually members one of another."

You weren't meant to be like others, God has gifted you and granted to you a particular way to glorify Him. The only way to live this out is to be yourself and let God's love shine within and through you. Whatever you do do it as a gift to God, to reflect God's love, in the power and giftedness that God has supplied to you.

Rom 12:6-8  "Having gifts that differ according to the grace given to us, let us use them: if prophecy, in proportion to our faith; if service, in our serving; the one who teaches, in his teaching;  the one who exhorts, in his exhortation; the one who contributes, in generosity; the one who leads, with zeal; the one who does acts of mercy, with cheerfulness." 

Here is the practicality of knowing God. genuinely loving. He is Absolute Love. Fervent, Zealous love, that in every way seeks to outdo itself in honoring God and others. 
It's very hard to do if you think yourself to be superior- wiser and more deserving than others. You can only love like this from a humble reliance on mercy and grace. 

Rom 12:9-16  "Let love be genuine. Abhor what is evil; hold fast to what is good. Love one another with brotherly affection. Outdo one another in showing honor.  Do not be slothful in zeal, be fervent in spirit, serve the Lord.  Rejoice in hope, be patient in tribulation, be constant in prayer. Contribute to the needs of the saints and seek to show hospitality.  Bless those who persecute you; bless and do not curse them. Rejoice with those who rejoice, weep with those who weep. Live in harmony with one another. Do not be haughty, but associate with the lowly. Never be wise in your own sight."

Why the need to be humble before God, in reliance on His mercy and grace? If you live like this you will encounter evil, Satan hates righteousness in any form. Many people do also, it is a judgment to some. They will oppose leaving you at peace. 

Rom 12:17,18  "Repay no one evil for evil, but give thought to do what is honorable in the sight of all. If possible, so far as it depends on you, live peaceably with all." 

Yet, here is the very difficult, narrow way of love. No avenging wrongs even though it may seem right to seek revenge. Judgement is the right reserved by God. Do not try to play God and become the very evil you are opposing. Doing good to enemies reflects the very nature of Jesus Christ. 

Rom 12:19-20  "Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, "Vengeance is mine, I will repay, says the Lord."  To the contrary, "if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by so doing you will heap burning coals on his head."

Rom 12:21  "Do not be overcome by evil, but overcome evil with good." 

He is Absolute Love and knows how to overcome evil, by His sacrificial love.

Php 2:3-8  "Do nothing from rivalry or conceit, but in humility count others more significant than yourselves. Let each of you look not only to his own interests, but also to the interests of others. Have this mind among yourselves, which is yours in Christ Jesus,  who, though he was in the form of God, did not count equality with God a thing to be grasped, but made himself nothing, taking the form of a servant, being born in the likeness of men. And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross."