Why would someone welcome the weak in faith in the church just to quarrel over opinions?

In Romans 14:1 we read that the care for the weak in faith should never lead to a quarrel over opinions (ESV), or disputable matters (NIV). Paul is connecting two words here. The first—diakrisis—means distinction, analysis while the other—dialogismos—refers to a person’s inner assessment and motivations. The care for a weaker brother should never be focused on analysing what motivates him. The words used aptly describe the administration of justice (see also Romans 14:4, Romans 14:10, Romans 14:12–13). You may not rout out a weaker brother or sister, but we ought rather to behave towards them as scrutinizing magistrates.

Some translations render do not quarrel over opinions as do not challenge their convictions (or beliefs), but this incorrectly suggests that the weak in faith held on to a different conviction and that this passage rather deals with tolerating convictions. This does not pertain to clear, theoretically sound convictions, however, but rather to anxious attitudes and inner thoughts. Others in the church should not analyse and examine them, but the concern for the weakness of a believer who harbours such attitudes and thoughts are much more important.¹