Paul gets to talking about disputable matters. These are not the things that are black and white in the Bible, but things they are somewhat grey. In Paul’s day, this could be what type of food you eat, days being considered holy or not, or others. In our own day, there are “disputable matters” as well like can I drink one beer, where we stand on politics, and the like.
There is much packed into Romans 14 and I highly encourage you to dig into it on these matters (especially on how we seek our position on such matters by the Spirit’s leading instead of our own personal wants and desires). When I was reading it this morning the above verse stood out to me matched with the verse below.
“So whatever you believe about these things keep between yourself and God. Blessed is the man who does not condemn himself by what he approves. But the man who has doubts is condemned if he eats, because his eating is not from faith; and everything that does not come from faith is sin. ” Romans 14: 22-23