About Heaven in Bible

JESUS ON UNDERSTANDING HEAVEN - Matthew 13:11
And the disciples came, and said unto him, "Why speaketh thou to them in parables?" He answered and said unto them, "Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given."

JESUS ON ENTERING HEAVEN - Matthew 18:2-6
"Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter the kingdom of heaven. Whosoever therefore humbleth himself as this little child, the same is greatest in the kingdom of heaven. And whosoever shall receive one such little child in my name receiveth me. But whoso shall offend one of these little ones which believeth in me, it were better for him that a millstone were hanged around his neck, and that he were drowned in the depth of the sea."

NUMBER OF PEOPLE (MEN) IN HEAVEN, SEX WITH WOMEN IS DEFILING (MALE VIRGINITY) - Revelation 14:3-4
And they sang a new song before the throne and before the four living creatures and the elders. No one could learn the song except the 144,000 who had been redeemed from the earth. These are those who did not defile themselves with women, for they kept themselves pure