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bible says all good and perfect things come from GOD, so if one beginning to desire for bad things then it mean it does not come from GOD, if it is good then it come from GOD.
You can know by reading the Bible daily. If your desires don't line up with God's Word then they are not from God. If it's not in the Word, for example, what college to attend, or who to marry, seek the Lord for wisdom in those areas where the Word is silent. Spend much time in the Word and prayer, and the Holy Spirit will reveal things to you. AMEN