Definitions: (1) application of steady effort to a purpose; constant exertion to accomplish what is undertaken; assiduous; industrious; (2) done with careful and dedicated resolve; painstaking attention to the task at hand

Synonyms: active, indefatigable, laborious, persevering, sedulous, unremitting, untiring

• Strive on with diligence. — Buddha’s last words (c. 563-483 BC) Nepalese holy man
     Note: “Diligence” in this quote is variously translated as earnestness, vigilance, awareness, heedfulness, etc.
• Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common. — Denis Diderot (1713–1784) French philosopher & chief editor of the first encyclopedia
     Note: This advice applies to any worthy effort.

Symbol: wings