Its very simple.

1. There are many verses that say God will have all people to be saved, God will reconcile all, God's judgments are for learning righteousness, all will be made righteous, death will be destroyed, God will do that which He says, it is good news - all nations will be blessed etc.

2. There are some other verses which say people/entities will be sent to eternal fire, everlasting punishment, judgment etc. There are also verses that say not everyone will...

KJV
Luke 12:10 And whosoever shall speak a word against the Son of man, it shall be forgiven him: but unto him that blasphemeth against the Holy Ghost it shall not be forgiven.

This sounds pretty dire. God will never forgive you for the sin of blasphemy?

Let's dig further. When we look in Matthew we see there is more information given:

KJV
Matt 12:31 Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men:...

...