Jealousy is never satisfied with anything short of an omniscience that would detect the subtlest fold of the heart.
You can only be jealous of someone who has something you think you ought to have yourself.
For a second I was almost jealous of the clouds. Why was he looking to them for an escape when I was right here beside him?
Jealousy, that dragon which slays love under the pretence of keeping it alive.
To jealousy, nothing is more frightful than laughter.
The way to love anything is to realize that it might be lost.
Gilbert Keith Chesterton
Relationships - of all kinds - are like sand held in your hand. Held loosely, with an open hand, the sand remains where it is. The minute you close your hand and squeeze tightly to hold on, the sand trickles through your fingers. You may hold onto some of it, but most will be spilled. A relationship is like that. Held loosely, with respect and freedom for the other person, it is likely to remain intact. But hold too tightly, too possessively, and the relationship slips away and is lost.
A mighty pain to love it is, and 'tis a pain that pain to miss; but of all the pains, the greatest pain is to love, but love in vain.
Lovers may be - and indeed generally are - enemies, but they never can be friends, because there must always be a spice of jealousy and a something of Self in all their speculations.