"underneath" (Deu 33:27): That is, arms that are long and strong,
and that can reach to the bottom, and also beyond, of all misery
and distress, that Christians are subject to in this life. Indeed
mercy seems to be asleep, when we are sinking: for then we are
as if all things were careless of us, but it is but as a lion
couchant, it will awake in time for our help (Psa 44:22,26, Mark
4:36-39). And forasmuch as this term is it, which is applicable
to the lion in his den; it may be to shew that as a lion, so will
God at the fittest season, arise for the help and deliverance of
a sinking people. Hence when he is said to address himself to the
delivering of his people, it is that he comes as a roaring lion.
"The Lord shall go forth as a mighty man, he shall stir up jealousy
like a man of war: he shall cry, yea, roar; he shall prevail
against his enemies" (Isa 42:13). However here is a depth against
the depth that's against us, let that depth be what it will. As
let it be the depth of misery, the depth of mercy is sufficient.
If it be the depth of hellish policy, the depth both of the wisdom
and knowledge of God shall go beyond it, and prevail.

This therefore is worthy of the consideration of all sinking souls;
of the souls that feel themselves descending into the pit. There
is such a thing as this experienced among the godly. Some come to
them (when tempted) when you will, they will tell you, they have
no ground to stand on, their feet have slipped, their foundation is
removed, and they fell themselves sinking, as into a pit that has
no bottom (Psa 11:3). They inwardly sink, not for want of something
to relieve the body, but for want of some spiritual cordial to
support the mind. "I went down to the bottoms of the mountains,"
said Jonah, "the earth with her bars was about me for ever;--my
soul fainted within me" (Jonah 2:6,7).