Rather than thinking about what difference you could make tomorrow, or even this year, ask yourself the question “what can I do that will make the most difference in 100 years?”
Why? 100 years is a good timespan because you’ll be dead by then. Any difference you could make would need to outlive you.
Dads and mums, that’s why parenting is worth your time and energy and sweat and tears. Strong families today are easily traced back to strong parents 100 years ago; both relationally and financially and spiritually.
Those in pastoral ministry; this is a good place to set your vision. What can you (under God) spend 40 years doing that will still make a difference in 100 years?
Of course, this is why we preach the gospel, not only does it create gospel workers, it also establishes souls in Christ for eternity.