Sonnet Xviii. The Source Of Happiness In The Soul Poem by Thomas Cogswell Upham

The soul hath power, through God's mysterious plan,
To mould anew and to assimilate
The outward incidents that wait on man,
And make them like his hidden, inward state.
If there's a storm within, then all things round
The inward storm to clouds and darkness changes;
But inward light makes outward light abound,
And o'er external things in beauty ranges.
If but the soul be right, submissive, pure,
If stamps whate'er takes place with peace and bliss;
If fierce, revengeful, and unjust, 'tis sure
From outward things to draw unhappiness.
Then watch, and chiefly watch, the inward part,
For all is right, and well, if there's a holy heart.