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Diligent
Diligence is one of the seven heavenly virtues. Diligent behavior is indicative of a work ethic; a belief that work is good in itself.
Wikipedia
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Diligent (adjective)
Performing with industrious concentration; hard-working and focused.
“Scientists are very diligent in their work.”
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Assiduous (adjective)
Hard-working, diligent or regular (in attendance or work); industrious.
Wiktionary
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Diligent (adjective)
having or showing care and conscientiousness in one’s work or duties
“after diligent searching, he found a parcel”
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Assiduous (adjective)
showing great care and perseverance
“she was assiduous in pointing out every feature”
Oxford Dictionary