The two great political parties of the nation have existed for the purpose, each in accordance with its own principles, of undertaking to serve the interests of the whole nation. Their members of the Congress are chosen with that great end in view.

Summary

This quote highlights the purpose and intent of the two major political parties in the nation. It stresses that both parties, each based on their own principles, strive to serve the interests of the entire nation. The parties select their members in Congress with the aim of achieving this greater objective. The quote suggests that despite their ideological differences, the parties share a common goal of working towards the betterment of the nation as a whole.