If I think that I understand it, then I can use that to deepen the practice, but it only becomes truly useful if I understand every moment. That is the characteristic of wisdom. Wisdom does not need time, wisdom understands immediately. Knowledge needs time. Wisdom experiences and knows immediately.
Wisdom is timeless.
Within the framework of direct experience, the concepts with which we have all grown up prove to be useless and hindering thought patterns. There is a reason for all of the opinions that can be found in the world. Which is not the same as saying that all of those reasons are plausible. Some things are not easy to explain, or within the complexity of cause and effect aren't even possible to explain. You are walking along the street and a flower pot falls from an upstairs windowsill.