It seems simple enough; but curiously, for many, the bible is locked to their understanding.

When questioned,Jesus said about this,

He replied, “Because the knowledge of the secrets of the kingdom of heaven has been given to you, but not to them.12 Whoever has will be given more, and they will have an abundance. Whoever does not have, even what they have will be taken from them.13 This is why I speak to them in parables: “Though seeing, they do not see; though hearing, they do not hear or understand.14 In them is fulfilled the prophecy of Isaiah: “‘You will be ever hearing but never understanding; you will be ever seeing but never perceiving.15 
For this people’s heart has become calloused; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts and turn, and I would heal them.’16 But blessed are your eyes because they see, and your ears because they hear.17 For truly I tell you, many prophets and righteous people longed to see what you see but did not see it, and to hear what you hear but did not hear it. – Matthew 13:11-17

http://www.biblegateway.com/passage/?search=Matthew13:11-17&version=NIV

Ezekiel was told the following:

He said to me, “Son of man, stand up on your feet and I will speak to you. ”As he spoke, the Spirit came into me and raised me to my feet, and I heard him speaking to me.He said: “Son of man, I am sending you to the Israelites, to a rebellious nation that has rebelled against me; they and their ancestors have been in revolt against me to this very day.The people to whom I am sending you are obstinate and stubborn. Say to them, ‘This is what the Sovereign Lord says.’And whether they listen or fail to listen —for they are a rebellious people —they will know that a prophet has been among them.And you, son of man, do not be afraid of them or their words. Do not be afraid, though briers and thorns are all around you and you live among scorpions. Do not be afraid of what they say or be terrified by them, though they are a rebellious people.You must speak my words to them, whether they listen or fail to listen, for they are rebellious.But you, son of man, listen to what I say to you. Do not rebel like that rebellious people; open your mouth and eat what I give you.”Then I looked, and I saw a hand stretched out to me. In it was a scroll,which he unrolled before me. On both sides of it were written words of lament and mourning and woe. – Ezekiel 2:1-10

http://www.biblegateway.com/passage/?search=Ezekiel2:1-10&version=NIV

Jesus also said the following

19 I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.” – Matthew 16:19

http://www.biblegateway.com/passage/?search=Matthew16:19&version=NIV

So now that we have keys, let’s practice how to use them…