This thirst David had and felt, when he said: My soul thirsted for the living God. - John of the Cross

Yea, if a man possess all things he cannot be content, — the greater his possessions the less will be his contentment, for the heart cannot be satisfied with possessions, but rather in detachment from all things and in poverty of spirit.

En una noche oscura, con ansias, en amores inflamada, ¡oh dichosa ventura!, salí sin ser notada, estando ya mi casa sosegada;

The third sign we have for ascertaining whether this dryness be the purgation of sense, is inability to meditate and make reflections, and to excite the imagination, as before, notwithstanding all the efforts we may make; for God begins now to communicate Himself, no longer through the channel of sense, as formerly, in consecutive reflections, by which we arranged and divided our knowledge, but in pure spirit, which admits not of successive reflections, and in the act of pure contemplation, to which neither the interior nor the exterior senses of our lower nature can ascend. Hence it is that the fancy and the imagination cannot help or suggest any reflections, nor use them ever afterwards.