One grain does not fill a bag but it helps.
This is a simple story most of us know from the bible.

Standing there in front of Jesus more than five thousand people, hungry after following Jesus for many days. Jesus looking at the crowd needed to prove to them one principle of life. To become great we have to start small. A boy with five loaves of bread and two fishes came out from the crowd. "How can this little meal feed all these people" the disciples complained. Jesus being the Son of God prayed and miraculously the five loaves of bread and two fishes multiplied and was more than enough to feed everybody and remained twelve baskets more. The meal meant for one person had fed more than five thousand people.
One grain does not fill a bag but it helps