The most important thing in the ability to give grace!
God Almighty does not wait for our merit to grant us grace. The most important thing that contributes significantly to the ability to give grace is the description of the chest that God gave to the Holy Prophet, may God bless him and grant him peace. It is good that we also ask God for the ability to lift the burden from the back and open the chest of the heart.
Grand Ayatollah Javadi Amoli, The Life of the Holy Prophet in the Qur'an, Vol. 1, p. 244