The secret things belong to the Lord our God

Deuteronomy 29:16-29
Make sure there is no man or woman ,clan or tribe among you today whose heart turns away from the Lord our God to go and worship the gods of those nations- the countries on the way they passed through
When such a person hears the words of this oath, he invokes a blessing on himself and therefore thinks,"I will be safe, even though I persist in going my own way" This will bring disaster on the watered land as well as the dry.
The Lord knows that Israelite will turn away from the Lord and go to worship the gods of other nations, so all the nations will ask: "Why has the Lord done this to this land? And the answer will be:"It is because this people abandoned the covenant of the Lord. Therefor the Lord's anger burned against this land.
The secret things belong to the Lord our God, but the things revealed belong to us and to our children forever, that we may follow all the words of the law.
Why?
The Lord said these warning message to the Israelite through Moses, but the heart of Israel after a few generation turned away from the Lord, and went to worship god, so all of these curses came upon them. All words are come truth as the Load says. How the heart of a man wicked and persists in going his own way?
People will curious in many unknown things, so someone will try to study the witch or the medium. All these are detestable things. The words written in the Bible are reveal to us, let us can obey it and get the blessing from the Lord.
How?
Focus on the Bible and understand the heart of the Lord, to be his hands work for Him, and be the voice of the Lord to preach gospel to others.