Bible Verses less Followed or Ignored

There are passages in the Bible that you seldom hear a sermon about.
They seem to be conveniently glossed over even by those who believe they are Bible based Christians.
One if simply adhered to and believed would solve a lot of doctrinal differences.
eg when we receive the Holy Spirit and what we must do to be saved.
That is Acts 2:38
Below is a little to show context.
One should read the whole chapter.
 "Acts 2

³⁶ “Therefore let all Israel be assured of this: God has made this Jesus, whom you crucified, both Lord and Messiah.”

³⁷ When the people heard this, they were cut to the heart and said to Peter and the other apostles, “Brothers, what shall we do?”
³⁸ Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit. ³⁹ The promise is for you and your children and for all who are far off—for all whom the Lord our God will call.”
⁴⁰ With many other words he warned them; and he pleaded with them, “Save yourselves from this corrupt generation.” ⁴¹ Those who accepted his message were baptized, and about three thousand were added to their number that day."

Another is the whole chapter about the Lord's Prayer and also the neccesity for Christians to forgive. 
Just part of Matthew 6 should be enough.
"Matthew 6
⁵ “And when you pray, do not be like the hypocrites, for they love to pray standing in the synagogues and on the street corners to be seen by others. Truly I tell you, they have received their reward in full. ⁶ But when you pray, go into your room, close the door and pray to your Father, who is unseen. Then your Father, who sees what is done in secret, will reward you. ⁷ And when you pray, do not keep on babbling like pagans, for they think they will be heard because of their many words. ⁸ Do not be like them, for your Father knows what you need before you ask him.
⁹ “This, then, is how you should pray:

“‘Our Father in heaven,
hallowed be your name,
¹⁰ your kingdom come,
your will be done,
    on earth as it is in heaven.
¹¹ Give us today our daily bread.
¹² And forgive us our debts,
    as we also have forgiven our debtors.
¹³ And lead us not into temptation,^[a]
    but deliver us from the evil one.^[b]’

¹⁴ For if you forgive other people when they sin against you, your heavenly Father will also forgive you. ¹⁵ But if you do not forgive others their sins, your Father will not forgive your sins."

When we pray the Lord's Prayer do we really want God to forgive us the way we forgive others.
Many of us are very unforgiving.
It is not optional for the Christian to forgive it is essential. 
It is important to note that God never asks us to do anything that we cannot do in His strength and it is always for our own good and that of others.