Merton quote help

Does anyone know where this Merton quote comes from?

"The reality that is present to us and in us; call it being…, silence.
And the simple fact that by being attentive, by learning to listen (or
recovering the natural capacity to listen), we can find ourselves
engulfed in such happiness, that it cannot be explained: the happiness
of being at one with everything in that hidden ground of love for which
there can be no explanations…. may we all grow in grace and peace, and
not neglect the silence that is printed in the centre of our being. It
will not fail us."