The construction of the now world famous Saint Gall Cathedral was initiated and supervised by Cölestin, albeit he did not live to see its completion.

On 18 October 1729, he travelled to Rome for study purposes and returned one year later with a doctoral degree.

With the intervention of Bern and (although showing little interest) Zurich, the abbot managed to receive the Toggenburgers' homage in due form in 1743.

The first negotiated solution regarding the rights of the subject territory, however, was only attained in 1755 - in consequence of pressure from France.

In several other parishes, Abbot Cölestin Gugger proved skill in solving conflicts on the path of negotiation, for instance when people in Rorschach were trying to rebel against the abbatial governance - on grounds of false accusations.

Ultimately, the conflict was settled in Rome by means of the exchange of lands (to Konstanz) for rights (to Saint Gall).

still had to restore order several times as Saint Gall and Konstanz did not want to adhere to the new rules and, for example, did not present a newly elected chaplain to the abbot, but, as before, to the bishop.

His diaries and his intentions for his life and regency, written down as mental exercise, testify to a rigorous piety and make one wonder how a prelate so much involved in business could maintain such a distinct spirituality.

on trade and to the advantage of the country, to build the granary in Rorschach in the year 1746, after the crack of the Italia Bognato, and to spend 457.929 fl.

to build the 312 feet long Saint Gall Cathedral, a part of the monastery and the clubhouse in St. Fiden and still bequeath 300.000 fl."