A friend sends this quote from Father Reginald Garrigou-Lagrange, O.P.:
The Church is intolerant in principle because she believes; she is tolerant in practice because she loves. The enemies of the Church are tolerant in principle because they do not believe; they are intolerant in practice because they do not love.
The terms could be reversed, at least for the Church: She is also tolerant in principle because she believes and intolerant in practice because she loves.