Book of Common Prayer (page 507)

Note:

The liturgy for the dead is an Easter liturgy. It finds all meaning in
the resurrection. Because Jesus was raised from the dead, we too, shall
be raised.

The liturgy, therefore, is characterized by joy, in the certainty that
"neither death, nor life, nor angels, nor principalities, nor things
present, nor things to come, nor powers, nor height, nor depth, nor
anything else in all creation, will be able to separate us from the love
of God in Christ Jesus our Lord."

This joy, however, does not make human grief unchristian. The very
love we have for each other in Christ brings deep sorrow when we are
parted by death. Jesus himself wept at the grave of his friend. So,
while we rejoice that one we love has entered into the nearer presence
of our Lord, we sorrow in sympathy with those who mourn.