Theophylact of Bulgaria
The Lord utilizes ‘seven loaves,’ which represents seven spiritual teachings, as the number seven symbolizes the Spirit. The Spirit fulfills all things, and our existence, along with this age, is realized in a sevenfold manner. Those who are enlightened partake and find satisfaction, leaving an abundance, for not all of God's wisdom can be encompassed. In the earlier miracle involving the five loaves, twelve baskets of remnants remained after feeding five thousand, indicative of those bound to the five senses; thus, they consumed sparingly but were content with a little, resulting in a surplus. In this instance, seven baskets were gathered after the seven loaves were given to four thousand people, signifying those grounded in the four virtues.
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As they were more robust, they ate heartily and left a lesser amount, retaining only what was too spiritual and profound for them to digest, which is represented by the seven baskets. From this narrative, we also learn to be content with only what is necessary and to seek nothing beyond that. For consider these individuals who, after eating to their fill, did not take the excess with them, but it was the disciples who collected the leftovers, similar to what occurred with the previously mentioned baskets. In the same manner, we should strive to be satisfied with what is provided to us in accordance with our needs.