The heart is the eye of human existence.

The clearer it is, the quicker, farther and more clearly it sees.

In the saints of God, however, even in this life, the eye is calibrated to the highest degree of clarity, which is why they see clearly, far and wide.

» Saint John of Kronstadt

Source:  pemptousia.com

http://www.diakonima.gr/2015/06/28/a-calibrated-eye-saint-john-of-kronstadt/