This passage in Morning and Evening encouraged my soul today...
Rejoice believer, but take care that your gladness has its spring in the Lord. You have much cause for gladness in God, for you can sing with David, "God my exceeding joy". Be glad that the Lord reigns, that Jehovah is King! Rejoice that He sits on the throne and rules all things! Every attribute of God should become a fresh ray in the sunlight of our gladness.
The fact that he is WISE should make us glad, knowing as we do our own foolishness.
That He is MIGHTY should cause us who tremble in our weakness to rejoice.
That He is EVERLASTING should always be a theme of joy when we know we wither like grass.
That He is UNCHANGING should provide a perpetual song, for we change every hour.
That He is FULL OF GRACE, that He is overflowing with it, and that His grace and covenant He has given to us, that it is ours to cleanse us, our to keep us, ours to sanctify us, ours to perfect us, ours to bring us to glory- ALL this should serve to make us glad in Him.