Assiduity

During the whole time of his abode in the university he generally spent thirteen hours of the day in study; by which assiduity besides an exact dispatch of the whole course of philosophy, he read over in a manner all classic authors that are extant[…]

Source: wiktionary

Her coyneſs was conquered by aſſiduity, and at laſt ſhe conſented to reſign the treaſure of her charms to my paſſion.

Source: wiktionary

With the most patient assiduity he peered into the intricacies of unrevealed structure. No object was too minute, none too large, for his attention.

Source: wiktionary

After a hurried and frugal meal we were introduced with loving assiduity upon the part of the manager to the contents of his engine-house, and to the miscellaneous scrap-heap of disused implements with which the grass was littered.

Source: wiktionary