Jay Dub, you asked " What is discipline from God?"
Wow, what a question to answer. I will try to answer you but not comprehensively, rather with a broad brush stroke, trying to paint a picture of HIS incomprehensible love. When our Loving Father disciplines us it is always in love and for our best ! When we are disobedient and refuse to do HIS will, HE will not bless us with HIS blessings, but rather wait until we come to see where we are wrong, repent and renew our fellowship with HIM. It is not that HE delights in not blessing us but HE delights in us doing HIS will, which is always best for us. We sometimes go so far down the wrong rout that HE may at times appear to want to do us harm by taking away things that we love or think that we cannot do without, but these are only our wrong reasonings. Imagine a child caught up in heroin addiction, to take away the heroine would seem to the child as taking away their only way of living ! but we know it is for their own good.
You also asked "We are told as we get close to the second coming of Jesus we will see more earthquakes like birth pains, are these Gods warnings to us to be ready? If yes, then what do we call it to those who lost their life or their homes in these quakes"
We are told by Jesus Himself that earthquakes and wars would increase, and that these would increase to wards the end. What do we call those who lost their life or homes ?? Victims ! Of Whom ? Not God ! There are many reasons but the real reason has more to do with economics than anything else.
And "The age of grace, does it also cover those who reject God?"
YES
Lilly you asked "what is the wrath of God that will be poured out in the last day's ?"
The wrath of God is HIS Righteous anger. A carefull reading of Revelation will show what will happen when HE pours it out !
Col 2:8 -10 Beware lest anyone cheat you through philosophy and empty deceit, according to the tradition of men, according to the basic principles of the world, and not according to Christ. For in Him dwells all the fullness of the Godhead bodily; and you are complete in Him, who is the head of all principality and power.