● 1Pet 5:5b . . and all of you, clothe yourselves with humility toward one another, for God is opposed to the proud, but gives grace to the humble.
The Greek word for "humble" is tapeinophrosune (tap-i-nof-ros-oo'-nay) which means lowliness of mind; viz: modesty, which Webster's defines as freedom from conceit or vanity. Lowliness of mind is to be greatly desired for its blessing.
● Matt 5:3 . . Blessed are the poor in spirit: for theirs is the kingdom of heaven.
Humility is very rare on internet forums. Active members are typically easily insulted and infected with vanity; plus imperious, domineering, despotic, assertive, confrontational, arrogant, conceited, reactive, thin-skinned, self-righteous, emotional, critical, and defensive. Those are not what I would call good Christian attributes. They also have a propensity to jump to conclusions, get the wrong impression, and fly off the handle. Those aren't good Christian attributes either; in point of fact; none of those attributes are blessing-worthy.
"Grace" is one of those ambiguous abstract nouns that nobody seems to agree upon. Noah found grace in God's eyes (Gen 6:8) which in his case, regarded providence; which can be defined as kindly patronage. It was by God's providence that Noah and his family survived the Flood while the sons of God and their harems didn't. Let that sink in. Just because people label themselves a Christian, and profess a belief in Christ, is no guarantee they'll escape the horrors of the book of Revelation. Noah was a righteous man, and perfect in his generation; too many of today's card-carrying Christians are neither.
The Greek word for "proud" is huperephanos (hoop-er-ay'-fan-os) which means appearing above others, viz: haughty. Those kinds of people typically regard others with contempt, i.e. undeserving of respect or even so much as common courtesy. Haughty people are typically cruel, thoughtless, insensitive, and badly infected with a superiority complex, which goes hand in hand with arrogance: defined as an exaggerated sense of one's importance, sometimes manifested in an overbearing manner.
Arrogant people can be intolerably pushy and assertive at times; standing up to them usually always provokes an indignant reaction and a call to arms, so to speak, because these folk regard any and all disagreements with their way of thinking as demeaning attacks upon their core values and their distorted sense of self worth. These people have very little interest in harmony; they're stand-up fighters whose primary interest is winning and/or suppressing the opposition.
Seeing as how Heaven is reputed a place of peace, then the arrogant, the haughty, and the proud cannot be allowed to go there with their unholy personalities. For sure they'd just end up making things very uncomfortable for Heaven's normally mild-mannered, affable society.