Commenting upon the phrase, “Praise the Lord, oh my Soul,” Calvin observed:
Although his heart was truly and seriously in the work, he would not rest in this, until he had acquired still greater ardour. And if it was necessary for David to stir himself up to the praises of God, how powerful a stimulant must we require for a more difficult matter when we aim at the divine life with self-denial. As to the religious exercise here mentioned, let us feel that we will never be sufficiently active in it, unless we strenuously exact it from ourselves. As God supports and maintains his people in the world with this view, that they may employ their whole life in praising him, David very properly declares, that he will do this to the end of his course.
John Calvin and James Anderson, Commentary on the Book of Psalms, vol. 5 (Bellingham, WA: Logos Bible Software, 2010), 285.
Calvin is pretty clear that the Christian life is a strenuous life. It’s certainly no easier than Stoicism, but it is certainly more rewarding.