Add punctuation: Philosophers humanists speak loftily of human worth as of supreme value in itself
A: Philosophers, humanists, speak loftily of human worth as of supreme value in itself.

Add punctuation: Even when working with the seams and eyelets one should always pay attention to the quality
A: Even when working with the seams and eyelets, one should always pay attention to the quality.

Add punctuation: The system is a simple steering system for delivery of ice on request
A:
The system is a simple steering system for delivery of ice on request.