Shimon Hatzadik was one of the remnants of the "Knesset Hagdola". He would say:

The world stands on account of three things:

• Torah,
• Divine Worship, and
• Acts of Kindness.

Bartenuro - Acts of Kindness

As is written, (Psalms 89) "the world is built on kindness". Acts of kindness include cheering up grooms, consoling mourners, tending to the ill, burying the dead, etc.