All things therefore whatsoever you would that men should do to you, do you also to them. For this is the law and the prophets. Enter ye in at the narrow gate: for wide is the gate, and broad is the way that leadeth to destruction, and many there are who go in thereat. How narrow is the gate, and strait is the way that leadeth to life: and few there are that find it! (Matthew 7:12-14 DRB)
Jesus does not seem as confident as your post about a great number who will travel the road to heaven.
"After this I beheld, and, lo,
a great multitude,
which no man could
number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands."
The Revelation of our Lord and Savior Jesus Christ
Chapter 7
"And if I have prophetic powers, and understand all mysteries and all knowledge, and if I have all faith, so as to remove mountains, but have not love, I am nothing.
If I give away all I have, and if I deliver up my body to be burned, but have not love, I gain nothing.
Love is patient and kind; love does not envy or boast; it is not arrogant
or rude. It does not insist on its own way; it is not irritable or resentful;
it does not rejoice at wrongdoing, but rejoices with the truth.
Love bears all things, believes all things, hopes all things, endures all things.
Love never ends. As for prophecies, they will pass away; as for tongues, they will cease; as for knowledge, it will pass away.
For we know in part and we prophesy in part,
but when the perfect comes, the partial will pass away.
When I was a child, I spoke like a child, I thought like a child, I reasoned like a child. When I became a man, I gave up childish ways.
For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall know fully, even as I have been fully known.
So now faith, hope, and love abide, these three; but the greatest of these is love."
1 Corinthians 13