But if Christ is in you, although the body is dead because of sin, the Spirit is life because of righteousness… he who raised Christ Jesus from the dead will also give life to your mortal bodies through his Spirit who dwells in you. Romans 8:10-11
Just like the seeds of a plant, any seeds of kindness we sow will grow and spread. When we are kind to others, it encourages them to be kind to their fellow humans as well, therefore spreading seeds of kindness far and wide.
When we first tell others about Jesus, perhaps nothing seems to happen. Yet like the seeds under the soil, we cannot see the work God is doing in the hearts of those with whom we have shared the good news.