When you need the enlightenment, help and presence of the Holy Spirit, here is a classic prayer composed by St. Augustine
Invocation by St. Augustine
Enlighten the dark corners of this neglected dwelling,
And scatter there thy cheerful beams!
Dwell in the soul which longs to be thy temple;
Water that barren soil overrun with weeds and briars,
And lost for want of cultivating,
And make it fruitful with thy dew from heaven…
Come, thou hope of the poor, and refreshment of them
that languish and faint.
Come, thou star and guide of them that sail in this tempestuous sea
of the world.
Thou only haven of the tossed and shipwrecked.
Come, thou glory and crown of the living,
And only safeguard of the dying.
Come, Holy Spirit, in much mercy,
Come, make me fit to receive thee.
—Augustine of Hippo