Example Sentences:

Ramayana:  Rama was pleased with the assiduity of the squirrel in carrying small dust particles for building the bridge, even if its actual help was insignificant as compared to that of the monkeys carrying giant boulders.

Mahabharata:  Arjuna’s assiduity in learning archery impressed Drona who reciprocated by teaching him secret weapons and skills.

Bhagavad-gita:  If we want to discipline our mind, we need assiduity to focus it wherever it wanders.