Tertullian

(And how worthy a thing is this, that, under the auspices of faith, men should congregate from all quarters to Christ! "See, how good and how enjoyable for brethren to dwell in unity!" This psalm you know not easily how to sing, except when you are supping with a goodly company!) But those conclaves first, by the operations of Stations and fastings, know what it is "to grieve with the grieving," and thus at last "to rejoice in company with the rejoicing." If we also, in our diverse provinces, (but) present mutually in spirit, observe those very solemnities, whose then celebration our present discourse has been defending, that is the sacramental law.