Cornerstone, stumblingstone or living stone?

 As you come to him, the living Stone—rejected by men but chosen by God and precious to him— you also, like living stones, are being built into a spiritual house to be a holy priesthood, offering spiritual sacrifices acceptable to God through Jesus Christ. For in Scripture it says:

“See, I lay a stone in Zion, a chosen and precious cornerstone, and the one who trusts in him will never be put to shame.”

Now to you who believe, this stone is precious. But to those who do not believe, “The stone the builders rejected has become the capstone, and, “A stone that causes men to stumble and a rock that makes them fall.” They stumble because they disobey the message—which is also what they were destined for.

[1Peter 2:4-8, NIV)

主乃活石，固然是被人所弃的，却是被　神所拣选、所宝贵的。你们来到主面前，也就像活石，被建造成为灵宫，作圣洁的祭司，藉著耶稣基督奉献　神所悦纳的灵祭。因为经上说：“看哪，我把所拣选、所宝贵的房角石安放在锡安，信靠他的人必不至于羞愧。”  所以，他在你们信的人就为宝贵，在那不信的人有话说：“匠人所弃的石头，已作了房角的头块石头。” 又说：“作了绊脚的石头，跌人的磐石。”他们既不顺从，就在道理上绊跌（注：或作“他们绊跌都因不顺从道理”）。他们这样绊跌，也是预定的。 [彼前 2:4-8]

I wiki "cornerstone" and it defines "The cornerstone (or foundation stone) concept is derived from the first stone set in the construction of a masonry foundation, important since all other stones will be set in reference to this stone, thus determining the position of the entire structure."

I been brought up to follow the rules-Do's and Don'ts. In school time, we will be punished if we break the rules and 99% of the rules & regulations are written such as: no talking while teacher in the class, no loitering around, no smoking, bla bla, you name it.

When I entered university, the rules get loosen: ...sigh, I can't even remember was there any rules to follow. We can smoke, skip class, copy assignments; as long as we pay our semester fee (and legally sounds), we will stay until we get our degree. I got more and more freedom. The freedom that I never experience before. I set the rule.

Not to say when I started my career, there is foul play! As long as you are beneficial to company and not caught by authority, you are perfectly ALRIGHT!

Worldly morale has gone too bad, more than I could ever imagine. Crimes, corruption, sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions and envy; drunkenness, orgies, etc.

Gos has chosen Jesus as the cornerstone. It is more than just a standard of living, but an abundant life. I am called to be His living stone in His house and not meant to be a stumbling stone which causes other to fall.

I admit I did caused some of my fellow friend "fell" to some extends. God is faithful and just, He is molding me, the incomplete and rough stone to His perfection.