Which preposition to use with insuperable

by Occurrences 1%

The reasons given by the ministry for refusing to convoke the Chambers at an earlier period were afterwards shewn not to be insuperable by their actual convocation on the 1st of December under a special call for domestic purposes, which fact, however, did not become known to this Government until after the commencement of the last session of Congress.

in Occurrences 1%

Nevertheless," he continued, seeing the light of hope break out on the face of the unfortunate young man, "I must impress upon you that the case presents enormous difficulties and that we must be prepared to find them insuperable in spite of all our efforts.

to Occurrences 1%

The difficulties attending it were long insuperable to the deepest thought as well as to popular belief; and the triumph of the modern and Christian idea of God is the result not merely of the eager forwardness of faith, but of the patient and inquiring waiting of reason.

Which preposition to use with  insuperable