"The science of politics is the one science that is deposited by the streams of history, like the grains of gold in the sand of a river; and the knowledge of the past, the record of truths revealed by experience, is eminently practical, as an instrument of action and a power that goes to making the future"

In this quote, Lord Acton highlights the value and sustaining significance of government, grounding it in historical context and experiential understanding. He suggests that political science is unique among sciences due to its structure in historical events and collected wisdom. By likening historic insights to "grains of gold in the sand of a river", Acton indicates that while much of history might appear mundane or irrelevant, valuable lessons-- similar to uncommon and precious gold-- can be obtained from it. These lessons are not simply theoretical however hold useful value, informing the method we act and make choices both in present and future political contexts.

Acton underscores the concept that political science, deeply rooted in historical knowledge, works as a useful tool or "instrument of action". This point of view positions the study of historic political events as important for understanding existing dynamics and anticipating or forming future outcomes. The expression "record of realities exposed by experience" further represents that the truths government offers are not abstract principles however are stemmed from concrete historical events and experiences, making them trustworthy.

Furthermore, Acton positions government as a "power that goes to making the future", thereby suggesting its active function in shaping social instructions and outcomes. It suggests that those who study and understand political history are much better equipped to affect future political landscapes. The comparative stability and continuity that political science deals are derived from its historic foundation, making it not just a science of understanding but also a guide for effective action.

In summary, Acton's quote commemorates the intersection of history and government as a vital source of knowledge and strength, highlighting its useful applications and its crucial role in forming both present and future political truths.