Now, we will disagree, sometimes fiercely, about how to get there. As it has for more than two centuries, progress will come in fits and starts. It's not always a straight line. It's not always a smooth path.

from President Barack Obama – 2012 Presidential Acceptance Speech on Rap Genius

Meaning

The President is stating a rather inconvenient truth; no matter what goal we as a nation set for ourselves, it will never be an easy goal to reach as their are various points of view, methods, and modes to reach our goals and thus, many counter productive issues that may hinder or prevent progress.

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