Jamie, please provide your source for this.
Okay - first I need to clarify what I said as it wasn't clear. It is "sense" knowledge which we lose after life. Here is a quote from St Thomas:
"Knowledge, therefore, acquired in the present life does not remain in the separated soul, as regards what belongs to the sensitive powers; but as regards what belongs to the intellect itself, it must remain[.]" S.T. I, q.89, art. 5
As an example of this, imagine there is a giant oak tree in your yard. When you die, you don't remember "this oak tree" you remember "oak tree" - the concepts (aspects of the intellect) remain, but the things known in reality through the senses (this oak tree) do not remain.
Perhaps more simply put: we remember the essence of things learned. We don't remember "the oak tree" we remember "oak treeness".
Caveat: I have sent a question to my logic professor to ensure that I am correct in this (it is based on the ST and one of our classes which mentioned this topic in passing). Once I hear back I will reply to confirm or denounce.
As for the issue of time, I presume that isn't what you needed clarification on - it is pretty self-evident that time is a consequence of matter and that the beatific vision exists outside of time and matter.