If one wishes to be a steward in God's house, he must first be prepared to serve as a scullion in the kitchen

Do not think of waiting until you can do some great thing for God; do little things, and then the Master will bid you go higher. Eleven years ago, I was a addressing Sunday-school children, and these alone. Ten,-nine years ago, I was preaching in little insignificant rooms here and there, generally going out and coming back on foot, and occasionally getting a lift in a cart. It has often happened that, when I have been going out to certain villages, the brooks would be so swollen that they could not be crossed in the usual way, so I would pull off my shoes and stockings, wade through up to my knees, then try to make myself tidy again as I best could, and go on to the little chapel to preach, and return home in the same way. Now, I am perfectly sure that, if I had not been willing to preach to those small gatherings of people in obscure country places, I should never have had the privilege of preaching to thousands of men and women in large buildings all over the land. If one wishes to be a steward in God's house, he must first be prepared to serve as a scullion in the kitchen, and be content to wash out the pots and clean the boots. Remember our Lord's rule, "Whosoever exalteth himself shall be abased; and he that humbleth himself shall be exalted."'

This is a thought provoking quote from Charles H. Spurgeon, a 19th century evangelist prominent for his lectures and sermons.  These are some things i gather from reading the quote:
1. Do not wait for opportunities to do great things for God.
2. Big opportunities begin from even the most menial tasks.
3. Be humble.
4.  God exalts those who humble themselves.
5.  It is God who exalts, not us.