When everywhere it is flooded, of what use is a well? That would be the case with Vedas for a spiritually enlightened Brāhmaṇa. (Vedas with their promises are irrelevant to him.)
In the light of true spiritual wisdom, which reveals the Self and its glory, the Vedas lose their relevance. They can give nothing more than what Self-knowledge will.
Self-realizational fulfilment is like water flooding all places. One amply gets the same water everywhere.
Self-realizational contentment is so full, abundant. Vedas prescribe a variety of rituals for a number of results. Each has to be performed first and its outcome awaited. Most benefits are only after the performer sheds his body.
It is like digging a well for drinking water, making a tank for bathing, a lake for still larger purposes, and needing a river for agriculture and irrigation. In spite of all these, whether one will strike or have abundant water as he desires is a big question! Equally indefinite are the results of Vedic rituals and promises!