These are the books I’ve read the most, given away the most, and recommended the most (ranked in the order I’d recommend reading them).
The Glory of Christ by John Owen
None But Christ by John Wall
Grow in Grace by Sinclair Ferguson
Prayer by Ole Hallesby
Love to the Unseen Christ by Thomas Vincent
The Precious Things of God by Octavius Winslow
The Institutes of the Christian Religion by John Calvin
Cultivating Epiphanies 