So whatever you believe about these things keep between yourself and God. Blessed is the one who does not condemn himself by what he approves. Romans 14:22
This verse is not saying you are to keep quiet about your liberties, that you do not say anything to anybody, that you keep it between yourself and God. What Paul is saying is, if you have faith, have it between yourself and God.
Let God’s Word be the basis for your faith, and nothing else. Be sure that what you are doing is not because of pride on your part, because you want to show off how free you are — you are doing this because God has freed you by his Word. If you have really based it on that, then your action will be one in which your conscience is free. You will not feel guilty and troubled as to whether you are acting beyond what the Word of God really says. You will be happy, free, blessed. But, if you do not, if you really have not settled this based on Scripture, but are acting only because you want to indulge yourself; if you like this thing but you still feel a bit troubled by it; if you act then, you are going to be condemned by your conscience. And if you are condemned by your conscience, you will feel guilty. And if you act because you feel guilty, you are not acting out of faith, and, therefore, you are sinning. This is Paul’s argument.