Christian in Complete Armour:

Written in the 17th century by Pastor William Gurnall and compiled into 365 readings by Bell, this collection supplies Christians with a soul-searching supplement to the Bible. Gurnall gives readers eternal knowledge that can be embraced daily, providing extra strength for victory.
'In our judgment, the best thought-breeder in all our library. John Newton said that if he might read only one book beside the Bible, he would choose The Christian in Complete Armour.'C. H. Spurgeon