Hymn for young people

Last night I was reading in volume 4 of The Publications of the American Tract Society (which by the way is REALLY good!!!) and I came across this hymn. It didn't say who the author was, so I looked it up, and sure enough, it was written by the illustrious Isaac Watts! I think this is based on part of Psalm 119, because the first stanza brought to mind this verse:

How can a young man keep his way pure? By keeping it according to Your word.

Here's the hymn:

INSTRUCTIONS FROM SCRIPTURE

How shall the young secure their hearts
And guard their lives from sin?
Thy Word the choicest rules imparts
To keep the conscience clean.

When once it enters to the mind,
It spreads such light abroad,
The meanest souls instruction find,
And raise their thoughts to God.

’Tis, like the sun, a heav’nly light
That guides us all the day,
And through the dangers of the night
A lamp to lead our way.

The men that keep Thy law with care,
And meditate Thy Word,
Grow wiser than their teachers are,
And better know the Lord.

Thy precepts make me truly wise:
I hate the sinner’s road;
I hate my own vain thoughts that rise,
But love Thy law, my God.

The starry heav’ns Thy rule obey,
The earth maintains her place;
And these Thy servants, night and day,
Thy skill and power express.

But still Thy law and Gospel, Lord,
Have lessons more divine;
Not earth stands firmer than Thy Word,
Nor stars so nobly shine.

Thy Word is everlasting truth;
How pure is every page!
That holy Book shall guide our youth
And well support our age.