This is a post by Andrei Bespalov (Pompeu Fabra University).

Political liberals put great value in political autonomy, which, in their view, makes it necessary for citizens to justify their preferred political decisions and actions to one another on the grounds of reasons that all of them may reasonably be expected to accept. Under the conditions of deep moral, religious, and philosophical disagreements, these proper public reasons should not rely on comprehensive doctrines that define what makes human life good as a whole. Instead, they should only draw on common sense, uncontroversial science, and liberal political conceptions of justice, such as John Rawls’s justice as fairness.