Because.

Matthew 17:17
"O unbelieving and perverse generation!" Jesus replied. "How long must I remain with you? How long must I put up with you? Bring the boy here to Me."

Matthew 14:30, 31
But when he saw the strength of the wind, he was afraid, and beginning to sink, cried out, "Lord, save me!" . . .

Hebrews 3:19
So we see that it was because of their unbelief that they were unable to enter.

If.

Matthew 21:21
"Truly I tell you, " Jesus replied, "if you have faith and do not doubt, not only will you do what was done to the fig tree, but even if you say to this mountain, 'Be lifted up and thrown into the sea, ' it will happen.

Mark 11:23
"Truly I tell you that if anyone says to this mountain, 'Be lifted up and thrown into the sea, ' and has no doubt in his heart but believes that it will happen, it will be done for him.

Luke 17:6
And the Lord answered, "If you have faith the size of a mustard seed, you can say to this mulberry tree, 'Be uprooted and planted in the sea, ' and it will obey you.

1 Corinthians 12:9
to another faith by the same Spirit, to another gifts of healing by that one Spirit,

1 Corinthians 13:2
If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have absolute faith so as to move mountains, but have not love, I am nothing.

faith.

a grain.

Matthew 13:31
Jesus put before them another parable: "The kingdom of heaven is like a mustard seed that a man planted in his field.

Mark 4:31
It is like a mustard seed, which is the smallest of all seeds sown upon the earth.

nothing.

Mark 9:23
"If You can?" echoed Jesus. "All things are possible to him who believes!"

Luke 1:37
For nothing will be impossible with God."

Luke 18:27
But Jesus said, "What is impossible with man is possible with God."