The song "Silent Worship" is a 1928 English-language adaptation for voice and piano by Arthur Somervell of Alessandro's aria "Non lo dirò col labbro" from Handel's 1728 opera Tolomeo (Ptolemy).
[1] Other arrangements of Somervell's translation include voice accompanied by a symphony orchestra, and unison choir.
[2] Musically Arthur Somervell's song is a simple arrangement of the original Handel aria – with the orchestral parts reduced for piano, one or two slight changes in harmony, and the instrumental ending (postlude) omitted.
Allessandro's cavatina in act 1 of Tolomeo: Non lo dirò col labbro Che tanto ardir non hà.
Forse con le faville Dell'avide pupille, Per dir come tutt'ardo, Lo sguardo parlerà.