well, as a matter of cognitive processing the mind certainly begins with the specific and prescinds from its specificity to the abstract - e.g. the mind takes what’s specific to the marks of ink on the page in my textbook, and then moves from there to the recognition that “1+1=2” is a true proposition.
but the question is an ontological one, at bottom: if propositions (for example) are abstract objects, and if the human mind is capable of being acquainted with them, then the human mind cannot be (only) concrete.
and propositions and sets and properties, etc. cannot just be patterns, since they exist whether or not there are any physical things patterning them.