Luke 12:6

Literally, hereby is signified the quickness of the Divine foresight, which reaches even to the least things. But mystically, the five sparrows justly represent the spiritual senses, which have perception of high and heavenly things: beholding God, hearing the Divine voice, tasting of the bread of life, smelling the perfume of Christ's anointing, handling the Word of Life. And these being sold for two farthings, that is, being lightly esteemed by those who count as perishing whatever is of the Spirit, are not forgotten before God. But God is said to be forgetful of some because of their iniquities.

(pluris estis) Now I ask the Arians, if God, as if disdaining to make all other things, made only His Son, but deputed all things to His Son; how is it that He extends His providence even to such trifling things as our hair, and the sparrows? For upon whatever things He exercises His providence, of these is He the Creator by His own word.

Our Lord then had instilled the virtue of simplicity, had awakened a courageous spirit. Their faith alone was wavering, and well did He strengthen it by adding with respect to things of less value, Are not five sparrows sold for two farthings? and not one of them is forgotten before God. As if He said, If God forgets not the sparrows, how can He man? But perhaps some one will say, How is it that the Apostle says, Does the Lord care for oxen? (1 Cor. 9:9.) whereas an ox is of more value than a sparrow; but to care for is one thing, to have knowledge another. Or else; A good sparrow is one which nature has furnished with the power of flying; for nature has given us the grace of flying, pleasure has taken it away, which loads with meats the soul of the wicked, and moulds it towards the nature of a fleshly mass. The five senses of the body then, if they seek the food of earthly alloy, cannot fly back to the fruits of higher actions. A bad sparrow therefore is one which has lost its habit of flying through the fault of earthly grovelling; such are those sparrows which are sold for two farthings, namely, at the price of worldly luxury. For the enemy sets up his, as it were, captive slaves, at the very lowest price. But the Lord, being the fit judge of His own work, has redeemed at a great price us, His noble servants, whom He hath made in His own image. Lastly, the numbering of the hairs is not to be taken with reference to the act of reckoning, but to the capability of knowing. Yet they are well said to be numbered, because those things which we wish to preserve we number. If then such is the majesty of God, that a single sparrow or the number of our hair is not beside His knowledge, how unworthy is it to suppose that the Lord is either ignorant of the hearts of the faithful, or despises them so as to account them of less value. Hence He proceeds to conclude, Fear not then, ye are of more value than many sparrows.

The dipondius is a coin of the lightest weight, and equal to two asses.

Or these five senses are sold for two farthings, that is, the New and Old Testament, and are therefore not forgotten by God. Of those whose senses are given up to the word of life that they may be fit for the spiritual food, the Lord is ever mindful.