okay ginger - that sounds like English Hmynal.
Now, iot could be the Original English Hymnal or its update, the New English Hymnal.
315 in EH is : Jesus, gentlest Savior, thou art in us now
"Jesus, gentlest Saviour,
God of might and power,
thou thyself art dwelling
in us at this hour.
Nature cannot hold thee,
heaven is all too strait
for thine endless glory
and thy royal state.
Out beyond the shining
of the furthest star
thou art ever stretching
infinitely far.
Yet the hearts of children
hold what worlds cannot,
and the God of wonders
loves the lowly spot.
Jesus, gentlest Saviour,
dwelling in us now,
fill us full of goodness
till our hearts o'erflow.
Multiply our graces,
chiefly love and fear,
and, dear Lord, the chiefest,
grace to persevere.
316 is: Just as I am without one plea; which I assume you know.
In the New English Hymnal,
315 is: Word of the Father, source of all things living (can't get the text online)
316 is: Sing to the Lord glad hymns of praise (which would fit with your service, as it was Baptism of Christ)