a seed
Examples
The fact that I can plant a seed and it becomes a flower, share a bit of knowledge and it becomes another's, smile at someone and receive a smile in return, are to me continual spiritual exercises.
Welcome to the truth of our world-a massive seed shot out to the stars, filled with deadly children. A seed designed to slay everything it touches.
Though I do not believe that a plant will spring up where no seed has been, I have great faith in a seed. Convince me that you have a seed there, and I am prepared to expect wonders.
A harvest of peace is produced from a seed of contentment.
Don't plant a seed in the sea.
A tree starts with a seed.