Chasidut for Menachot 219:18

I heard from my teacher of blessed memory that it happens that some need to strengthen themselves before prayer, in order to have the mental channels (mochin) open to pray without any foreign thoughts at all, or to pray with cleaving. This is done by singing or by studying Torah before standing to pray, and this opens up the mental channels. There are some, however, who when they begin with many songs and Torah study have no mental channels open for prayer. This is the meaning of the Talmudic teaching (Menachot 110a): "One who brings much or one who brings little [are equal], as long as their heart is directed towards heaven" - as long as one has these mental channels, mochin, they are equal. We have thus solved the difficulty brought up by the Taz (on Orach Chayim 1:4) - and the words of the wise are pleasant.