All are originated by the mind, and the extermination of the mind will result in the disappearance of all.

-- Lankavatara Sutra

One should purify his mind if he wants to reach the Pure Land, for the availability of a Pure Land is based on the purity of the mind.

-- Vimalakirti Sutra

The vexation of a mind will result in all the living beings' vexation; and the purity of a mind will effectuate all the living beings' purity.

-- Samyuktagama Sutra

With the mind fixed on a certain point, there will be nothing too difficult.

-- The Sutra of Buddha's Bequeathed Teaching

Commit one wholesome act rather than all the unwholesome ones. I humbly heard that the Lord Buddha said that all kinds of unwholesome matters are conquered by maintaining a wholesome mind.

-- The Mahaparinirvana Sutra