A most sublime gift of heavenly contemplation and prayer was the fruit of this great saint's holy retirement. Whole nights seemed to him short in those exercises, and when the rising sun in the morning seemed to him too soon to call him from his knees to his manual labor, or other employments, he would lament that the incomparable sweetness which he enjoyed, in the more perfect freedom with which his heart was taken up in heavenly contemplation in the silent watching of the night, should be interrupted or abated. But the foundation of his most ardent charity, and that sublime contemplation by which his soul soared in noble and lofty flights above all earthly things, was laid in the purity and disengagement of his affections, the contempt of the world, a most profound humility, and the universal mortification of his senses and of the powers of his soul. Hence flowed that constant tranquillity and serenity of his mind, which was the best proof of a perfect mastery of his passions. St. Athanasius observes of him, that after thirty years spent in the closest solitude, "he appeared not to others with a sullen or savage, but with a most obliging sociable air."[30] A heart that is filled with inward peace, simplicity, goodness, and charity, is a stranger to a lowering or contracted look. The main point in Christian mortification is the humiliation of the heart, one of its principal ends being the subduing of the passions. Hence, true virtue always increases the sweetness and gentleness of the mind, though this is attended with an invincible constancy, and an inflexible firmness in every point of duty. That devotion or self-denial is false or defective which betrays us into pride or uncharitableness; and whatever makes us sour, morose, or peevish, makes us certainly worse, and instead of begetting in us a nearer resemblance of the divine nature, gives us a strong tincture of the temper of devils.