By sowing seeds, I'm just using a metaphor for giving.
I sow seeds (in this case money) into the Kingdom og God
I also sow seeds of service, time, love etc.
I use the metaphor because in Genesis, we have the promise that as long as the earth remains, there will be seed time and harvest.
This means I can expect a harvest. And seed reproduces after its own kind. That's all.
If you're more comfortable, I could say that I still give financially to support the Kingdom of God. That's all I meant.
Will