We have received the commandment to love God: the soul bears the capacity to love implanted within itself by God at its first constitution. Of this we need no proof from without, for each may discover the traces of what we say within himself and from himself. Every human being desires all that is good, and we are drawn by a kind of natural disposition towards all that we think to be good. Indeed, without being taught, we are drawn in love towards blood relatives and those closest to us in the flesh, while we are attached with our whole affection and good services to those from whom we receive benefits.
But what greater good can we have than God? Indeed, what other good is there but God alone (cf. Matt 19:17)? What loveliness, what splendour, what beauty which we are naturally moved to love is of such a kind as is in God and more claims our confidence? What grace is so great, what flame of love which sets alight the secret and inward places of the soul is like to that love of God which ought to inflame the hidden places of the mind, especially if it is cleansed of all defilement, if it is a pure soul which with true affection says: I am wounded by love (Song 2:5)?
The utterly ineffable love of God— as I at any rate experience it— which can be more easily experienced than spoken of, is a certain inexplicable light. Even if speech should cite or compare a lightning flash or a dazzling brilliance, still, the hearing cannot take it in. Invoke if you will the rays of the morning star, the splendours of the moon, or the light of the sun itself— in comparison with that glory they are all more obscure and murkier by far than an ink-black night and the gloom of a dense fog compared with the flawlessly clear light of the noon-day sun.
Such loveliness is not seen by bodily eyes; it is perceived only by the soul and the mind. If perchance this loveliness has grazed the mind and heart of the saints, it left embedded in them a most fiery sting of yearning for it, till at length, as if languishing in the fires of such love and shuddering at this present life, such as these would say: When shall I come and appear before the face of God? (Ps 41:2), and again, one who is burning in the flames of this ardour would say: My soul has thirsted for the living God (Ps 41:1), and being insatiable in his desire, would pray that he might see the delight of the Lord and find shelter in his holy temple (Ps 26:4). So therefore we naturally long for and love the good. (The Rule of St Basil)