The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1 : I had not seen my father for several years.
S6 : His words sank deep into my heart.
P : I met him late one evening in his flat.
Q : I wrote him a note suggesting a very early meeting.
R : He listened to my story in silence.
S : When he spoke, his voice was soft but without warmth.
Select the correct sequence.