32. Many of the Fathers say that the question of tears, especially in the case of beginners, is an obscure matter and hard to ascertain, as tears are born in many different ways. For instance, there are tears from nature, from God, from adverse suffering, from praise worthy suffering, from vainglory, from licentiousness, from love, from the remembrance of death, and from many other causes.
33. Let us, stripped by the fear of God, train ourselves in all these ways, and acquire for ourselves pure and guileless tears over our dissolution. For there is no dissimulation or self-esteem in them, but on the contrary there is purification, progress in love for God, washing away of sin and the sublimation of the passions to dispassion.
(St. John Climacus, The Ladder of Divine Ascent, Step 7 On mourning which causes joy)