"I am only one, but still I am one," emphasizes the value of individual effort and the importance of each person's contribution, no matter how small. It highlights that even a single person can make a difference by doing what they can, despite limitations.
"I cannot do everything, but still I can do something," encourages taking action in areas where one has influence. The quote inspires people to recognize their potential to contribute positively, and to understand that their efforts, no matter how limited, are worthwhile and meaningful.