One of the errors of Nineveh was that they were very proud. The LORD says in Zephaniah that they “dwelt carelessly” and “said in her heart, I am, and there is none beside me.” They rejoiced in this pride, thinking only of themselves, dwelling carelessly. The full verse says,
"This is the rejoicing city that dwelt carelessly, that said in her heart, I am, and there is none beside me: how is she become a desolation, a place for beasts to lie down in! Every one that passeth by her shall hiss, and wag his hand." [Zeph 2:15]
This is something we should be always looking out for. We do not want to be selfish like Nineveh, dwelling carelessly and rejoicing in that lifestyle. Instead, we ought to, as Peter says, “pass the time of [our] sojourning here in fear.” Because we have been bought with an extremely expensive price. Jesus died for us. Again Peter says,
"Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers; but with the precious blood of Christ, as of a lamb without blemish and without spot." [1 Pe 1:18-19]
The high price which Jesus paid should provoke us to live in fear, not carelessly like Nineveh. And it should move us to selflessly give our lives up for the brethren. For, “hereby perceive we love, because He laid down His life for us: and we ought to lay down our lives for the brethren.” [1 Jn 3:16]
It will do us good to remember that there are those beside us. We are not the center of all activity, but are a small member of the body of Christ. Luke writes in Acts quoting Paul,
"I have shewed you all things, how that in this manner, laboring until worn out, it is necessary to support those without strength, and to remember the words of The Lord Jesus, how He said, 'it is more blessed to give than to receive.'" [Acts 20:35]
Remember, Jesus paid a very high price for us. Therefore, we should seek to be conformed to His holiness, living righteous lives, and submitting to Him in fear. We also ought to give our lives up for His body, serving and loving the brethren. It is no longer about us: we have been purchased out of the world and regenerated so that Jesus can live through us by His Holy Spirit: we have bigger things to worry about now than our own selfish desires.