The narrow gate is a road of suffering. It is also a faithful promise of great reward.
The fact that we are not wanted here, in this world, to us should be living evidence that we belong to a different Kingdom.
The fact that we are reproached for the name of Christ, alone bears witness that we are sealed with His name.
What does it mean to be sealed with His name? In the book of Revelation chapter 7 we read that there are angels who are actually commanded to “…[seal] the servants of our God IN their foreheads” (vs.3; emphasis mine). And in chapter 9, when the scorpion-like-locusts arise, they are forbidden to harm those men who have “…the seal of God in their foreheads” (vs.4). So I believe this is both a literal event, and a spiritual one.
Interestingly enough, a study published in 2012 using neuroimaging technology, discovered that there is a specific brain region linked to one’s level of desire to conform to societal “norms”. This region happens to be called the lateral orbitofrontal cortex, located centrally above and behind the eyes, or, in the forehead. (http://psychcentral.com/news/2012/02/21/brain-region-linked-to-social-conformity/35087.html)
Although as humans we seem to be born with a need to belong and be accepted, I can say from experience that placing your confidence in the approval of the world is a sure path to destruction. But what should trouble any born-again believer, is if worldly groups who are attached to material idolatry and pride-lust mentalities, embrace and accept you as their own.
“Beloved, think it not strange concerning the fiery trial which is to try you, as though some strange thing happened unto you: But rejoice, inasmuch as ye are partakers of Christ’s sufferings; that, when his glory shall be revealed, ye may be glad also with exceeding joy. If ye be reproached for the name of Christ, happy are ye; for the spirit of glory and of God resteth upon you: on their part he is evil spoken of, but on your part he is glorified.” (1 Peter 4:12-14)