“Love lieth deep; Love dwells not in lip-depths.”

On her dark night of spiritual desolation amidst devotion, in a letter addressed to Jesus, as quoted in Mother Teresa: Come Be My Light (2007) edited by Father Brian Kolodiejchuk, p. 192; regarding this quote, Fr. Kolodiejchuk writes: "...when addressing Jesus — that is, in prayer — she could express herself with ease. Fufilling her confessor's request, she sent to him a letter addressed to Jesus, enclosing it with her letter dated September 3, 1959." https://books.google.com/books?id=P4cqT0nK_joC&pg=PA192&dq=%22when+addressing+Jesus+-+that+is,+in+prayer+-+she+could+express+herself+%22&hl=en&sa=X&ved=0ahUKEwjk0IOm5vTOAhVF1x4KHYdRDE4Q6AEIHDAA#v=onepage&q=%22when%20addressing%20Jesus%20-%20that%20is%2C%20in%20prayer%20-%20she%20could%20express%20herself%20%22&f=false
1950s
Context: My own Jesus,
They say people in hell suffer eternal pain because of the loss of God – they would go through all that suffering if they had just a little hope of possessing God. In my soul I feel just that terrible pain of loss, of God not wanting me, of God not being God, of God not really existing (Jesus, please forgive my blasphemies, I have been told to write everything). That darkness that surrounds me on all sides. I can’t lift my soul to God – no light or inspiration enters my soul. I speak of love for souls, of tender love for God, words pass through my words sic, lips], and I long with a deep longing to believe in them! What do I labour for? If there be no God—there can be no soul.—If there is no soul then Jesus—You also are not true... Jesus don't let my soul be deceived—nor let me deceive anyone. In the call You said that I would have to suffer much.—Ten years—my Jesus, You have done to me according to Your will—and Jesus hear my prayer—if this pleases You—if my pain and suffering—my darkness and separation gives You a drop of consolation—my own Jesus, do with me as You wish—as long as You wish, without a single glance at my feelings and pain... I beg of You only one thing—please do not take the trouble to return soon.—I am ready to wait for You for all eternity.

1820s, Signs of the Times (1829)

Source: Animal Dreams

Source: The Life of St. Teresa of Jesus (c.1565), Ch. XXV. "Divine Locutions. Discussions on That Subject" ¶ 22 & 23
Context: All things fail; but Thou, Lord of all, never failest! They who love Thee, oh, how little they have to suffer! oh, how gently, how tenderly, how sweetly Thou, O my Lord, dealest with them! Oh, that no one had ever been occupied with any other love than Thine! It seems as if Thou didst subject those who love Thee to a severe trial: but it is in order that they may learn, in the depths of that trial, the depths of Thy love. O my God, oh, that I had understanding and learning, and a new language, in order to magnify Thy works, according to the knowledge of them which my soul possesses! Everything fails me, O my Lord; but if Thou wilt not abandon me, I will never fail Thee. Let all the learned rise up against me, — let the whole creation persecute me, — let the evil spirits torment me, — but do Thou, O Lord, fail me not; for I know by experience now the blessedness of that deliverance which Thou dost effect for those who trust only in Thee. In this distress, — for then I had never had a single vision, — these Thy words alone were enough to remove it, and give me perfect peace: "Be not afraid, my daughter: it is I; and I will not abandon thee. Fear not."
It seems to me that, in the state I was in then, many hours would have been necessary to calm me, and that no one could have done it. Yet I found myself, through these words alone, tranquil and strong, courageous and confident, at rest and enlightened; in a moment, my soul seemed changed, and I felt I could maintain against all the world that my prayer was the work of God. Oh, how good is God! how good is our Lord, and how powerful! He gives not counsel only, but relief as well. His words are deeds. O my God! as He strengthens our faith, love grows.

Love Made in the First Age: To Chloris (l. 13–18).
Context: Love, then unstinted, Love did sip,
And cherries plucked fresh from the lip;
On cheeks and roses free he fed;
Lasses like autumn plums did drop,
And lads indifferently did crop
A flower and a maidenhead.

The Museum of Innocence

Voces (1943)

1960s, (1963)

"Marriage and Love" in Anarchism and Other Essays (1911)
Context: Love, the strongest and deepest element in all life, the harbinger of hope, of joy, of ecstasy; love, the defier of all laws, of all conventions; love, the freest, the most powerful moulder of human destiny; how can such an all-compelling force be synonymous with that poor little State and Church-begotten weed, marriage?
Free love? As if love is anything but free! Man has bought brains, but all the millions in the world have failed to buy love. Man has subdued bodies, but all the power on earth has been unable to subdue love. Man has conquered whole nations, but all his armies could not conquer love. Man has chained and fettered the spirit, but he has been utterly helpless before love. High on a throne, with all the splendor and pomp his gold can command, man is yet poor and desolate, if love passes him by. And if it stays, the poorest hovel is radiant with warmth, with life and color. Thus love has the magic power to make of a beggar a king. Yes, love is free; it can dwell in no other atmosphere.