You left out most of the scripture, it says:
For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
That’s not possible knowing who the elect is.
Under promise, over deliver. This will the exceed hopeful the expectation of many.
If something is under promised, it means the expectation is exceeded. If the delivery exceeds the expectation that means the original expectation was lower or less than what was received. Both are a good thing.
It’s another way of saying, under under.
The antichrist is anything we as individuals express that is not the Christ nature. There is an antichrist that comes with every soul born. The objective is to eliminate it from our individuals lives. Every man must work out his own salvation. As the Christ nature is resurrected in us, the antichrist nature is crucified and dies off. “He (Christ) must increase but I must decrease.” That is what the death and resurrection of Christ is…our death and his resurrection.
You won’t hear that every day, two or three times in your life.