Answer from Master Keisen
This is what zazen does, it helps you on your achievement, spiritual, and with it then you can be available to turn yourself to the others.
Practicing peace, love and compassion, as well as rightness, increases peace and love and wisdom of the world. So also directly practicing it helps everyone.
Continue with courage, the vow of the bodhisattva is to save everyone, although he knows that during his short life that might not be possible, but he still continues. That's why this is a vow.
Mondo On the same theme : Zazen
To know more about mondo
You may want to see other themes of this mondo online, or ask your own question : see Mondo online : questions to zen Master Kosen Thibaut