The two passages you mention were separated by 135 words, not 30 days. They were part of the same pledge, that the government would continue in its duties and not press the issue in the hopes that a peaceful resolution could be found. The policy changed, of course, when the confederate army fired on Sumter.
Our Great Mr. Lincon went from this policy-----So far as possible, the people everywhere shall have that sense of perfect security..on March 4, 1861, to this on March 29:
After the meeting on this same day, Lincoln sent notes to the Secretaries of War and Navy:
“I desire that an expedition, to move by sea, be got ready to sail as early as the 6th of April…”
And I point out to you that that was not 135 words of distance, but a monumental reversal of policy, especially in view of the lack of support from his cabinet and the military.
He was moving from caution, at the time of his inauguration, through deliberate deception and conspiracy at the end of March, and entering into military adventurism.
And don't be silly about Beauregard. I could just as easily argue that his action was pre-emptive to avoid a major naval engagement in the harbor, as had happened the January prior.
No, you are fleeing from the point. What happened between March 4 and March 29 to change his policy?