These are the Puritan works that have impacted me the most, the ones which I return to time and time again. They always pay dividends. (ranked in the order I’d recommend reading them).
None But Christ by John Wall
The Rare Jewel of Christian Contentment by Jeremiah Burroughs
The Loveliness of Christ by Samuel Rutherford (compiled from his letters which are also excellent)
The Glory of Christ by John Owen
Communion with God by John Owen
The Bruised Reed by Richard Sibbes
The Doctrine of Repentance by Thomas Watson
Spiritual Mindedness by John Owen
Heaven Is a World of Love by Jonathan Edwards
Valley of Vision by various puritan writers (compiled by Arthur Bennett)
Heaven Taken by Storm by Thomas Watson
The Mystery of Providence by John Flavel
Precious Remedies Against Satan’s Devices by Thomas Brooks
All Loves Excelling by John Bunyan
The Christian’s Great Interest by William Guthrie
All Things for Good by Thomas Watson
The Godly Man’s Picture by Thomas Watson
The Love of Christ by Richard Sibbes