“They had created themselves together, and they always saw themselves, their youth, their love, their lost youth and lost love, their failures and memories, as a sort of living fiction.”

Source: Everything I Never Told You

Sādhanā : The Realisation of Life http://www.spiritualbee.com/spiritual-book-by-tagore/ (1916)
Context: In love all the contradictions of existence merge themselves and are lost. Only in love are unity and duality not at variance. Love must be one and two at the same time.
Only love is motion and rest in one. Our heart ever changes its place till it finds love, and then it has its rest. But this rest itself is an intense form of activity where utter quiescence and unceasing energy meet at the same point in love.
In love, loss and gain are harmonised. In its balance-sheet, credit and debit accounts are in the same column, and gifts are added to gains. In this wonderful festival of creation, this great ceremony of self-sacrifice of God, the lover constantly gives himself up to gain himself in love. Indeed, love is what brings together and inseparably connects both the act of abandoning and that of receiving.

Quoted, This Side of Paradise (1920)

Attributed
Source: July 1968, referring to the Lennebergwald (Lenneberg Forest) and youthful hikers, Mainz, Germany.

Source: Every Day

The Passionate Pilgrim: A Madrigal; there is some doubt about the authorship of this.

Source: Tender Is the Night

Source: Baudolino (2000), Chapter 7, "Baudolino makes the Poet write love letters and poems to Beatrice"