Matt 5:48
"You have heard that it was said, 'You shall love your neighbor and hate your enemy.' But I say to you, Love your enemies and pray for those who persecute you, so that you may be sons of your Father who is in heaven. For he makes his sun rise on the evil and on the good, and sends rain on the just and on the unjust. For if you love those who love you, what reward do you have? Do not even the tax collectors do the same? And if you greet only your brothers, what more are you doing than others? Do not even the Gentiles do the same? You therefore must be perfect, as your heavenly Father is perfect."
So, you're saying that this verse tells us to be perfect as in completely sinless? In the context, that is not what it is saying, is it? It's saying to respond to others in a Godly way - in the way that the Father would. Apparently some in this thread have already fallen when it comes to this verse.
Heb 10:14:
For since the law has but a shadow of the good things to come instead of the true form of these realities, it can never, by the same sacrifices that are continually offered every year, make perfect those who draw near. Otherwise, would they not have ceased to be offered, since the worshipers, having once been cleansed, would no longer have any consciousness of sins? But in these sacrifices there is a reminder of sins every year. For it is impossible for the blood of bulls and goats to take away sins.
Consequently, when Christ came into the world, he said,
"Sacrifices and offerings you have not desired,
but a body have you prepared for me;
in burnt offerings and sin offerings
you have taken no pleasure.
Then I said, 'Behold, I have come to do your will, O God,
as it is written of me in the scroll of the book.'"
When he said above, "You have neither desired nor taken pleasure in sacrifices and offerings and burnt offerings and sin offerings" (these are offered according to the law), then he added, "Behold, I have come to do your will." He does away with the first in order to establish the second. And by that will we have been sanctified through the offering of the body of Jesus Christ once for all.
And every priest stands daily at his service, offering repeatedly the same sacrifices which can never take away sins. But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God, waiting from that time until his enemies should be made a footstool for his feet. For by a single offering he has perfected for all time those who are being sanctified.
And the Holy Spirit also bears witness to us; for after saying,
"This is the covenant that I will make with them
after those days, declares the Lord:
I will put my laws on their hearts,
and write them on their minds,"
then he adds,
"I will remember their sins and their lawless deeds no more."
Where there is forgiveness of these, there is no longer any offering for sin.
I don't see anything in this passage that says we are sinless and perfect in this life. Verse 14 tells us that we are perfected - that we have been made complete in Christ yet it then tells us that we are BEING sanctified, which means being purified. Why would we need to be purified if we are perfect in this life? We know through the whole of Scripture that we are still sinful in this life but we are being changed into His likeness from one degree of glory to another (2 Cor. 3:18). If we are sinless, why does Paul tell us to flee from immorality? To now yield to righeousness? To press on towards the goal? That our new nature is being renewed in knowledge after the image of it's creator? To strive for holiness? In fact, the vast majority of the New Testament is instruction on how to live in holiness. If we are sinless and perfect, why would we need this instruction?
Hebrews 12:23
For you have not come to what may be touched, a blazing fire and darkness and gloom and a tempest and the sound of a trumpet and a voice whose words made the hearers beg that no further messages be spoken to them. For they could not endure the order that was given, "If even a beast touches the mountain, it shall be stoned." Indeed, so terrifying was the sight that Moses said, "I tremble with fear." But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, and to innumerable angels in festal gathering, and to the assembly of the firstborn who are enrolled in heaven, and to God, the judge of all, and to the spirits of the righteous made perfect, and to Jesus, the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel.
Is this speaking of heaven or earth?