Mercy
The ultimate mercy is built into Existence: there is only what is happening in the present, and it is always new and fresh.
The past and future is only present as abstractions, and when we see them as just abstractions, and notice what is here, their apparant substance evaporate in the brilliancy and vibrancy of what is.
Any other forms of mercy, as welcome as they may be, fade in comparison with this... the mercy of an Existence which only exists here now and is always new and fresh.