Definition: having the capacity or power to produce positive effects on others by intangible or indirect means; effective

Synonyms: authoritative, convincing, guiding, leading, persuasive, potent

• Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.— Archimedes (287-212 BC) Greek mathematician
• My favorite parable for living a positive and influential life is the Golden Rule: ‘Do unto others what you would have them do unto you.’ — Anthony Michael [Tony] Oller (1991-) American singer, songwriter

Comment: Keep up the good work; it may just influence one person or it could be far-reaching – maybe how you treated that single child will shape in them a positive attitude.