Charles Spurgeon preached to thousands in London each Lord’s day, yet he started his ministry by passing out tracts & teaching a Sunday school class as a teenager.
He was eventually invited to remote places in the country side to preach & after that became known as one of the greatest preachers in England.
Spurgeon said: “I am perfectly sure, that if I had not been willing to preach to those small gatherings of people in remote country places, I should never have had the privilege of preaching to thousands of men & women in large buildings all over the land.”
Source: C. H. Spurgeon’s Autobiography, Volume 2 (ministry127.com)
Luke 16:10 (GNT): “Whoever is faithful in small matters will be faithful in large ones; whoever is dishonest in small matters will be dishonest in large ones.”
1 Cor 15:58 (GNT): “So then, my dear friends, stand firm and steady. Keep busy always in your work for the Lord, since you know that nothing you do in the Lord's service is ever useless.”