the double meaning is the sea of life. Fenerty
Hence Christian learn
when tossed and driven
O’er life’s tempestuous sea,
The saviour from his throne in Heaven
Can calm its storms for thee.
first eight stanzas are basically the boat sets
sail, port is out of sight, a storm develops,
too late to turn back, storm gets worse, the
boat is out of control, high waves, waves of
water falling on them. This is analogous to
how life begins for each of us, and more so
when efforting towards a goal. As that big wave
of water falls straight for us, there looks
like little hope. And even when hope appears,
it is easily doubted.