“Obama is probably smarter than Franklin Roosevelt was but lacks the full thrust of Roosevelt's providential self-confidence.”

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter CIV: On Care of Health and Peace of Mind

Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!

Source: One Nation Under God: How Corporate America Invented Christian America (2015), p. 7

Source: Soldiers Live (2000), Chapter 5, “An Abode of Ravens: Headquarters” (p. 382)

Also translated as: It is not because things are difficult that we do not dare, but because we do not dare, things are difficult.
Letter CIV, verse 26
Epistulae Morales ad Lucilium (Moral Letters to Lucilius)
Context: But how much more highly do I think of these men! They can do these things, but decline to do them. To whom that ever tried have these tasks proved false? To what man did they not seem easier in the doing? Our lack of confidence is not the result of difficulty. The difficulty comes from our lack of confidence.

Recreation (1919)
Context: I am not attempting here a full appreciation of Colonel Roosevelt. He will be known for all time as one of the great men of America. I am only giving you this personal recollection as a little contribution to his memory, as one that I can make from personal knowledge and which is now known only to myself. His conversation about birds was made interesting by quotations from poets. He talked also about politics, and in the whole of his conversation about them there was nothing but the motive of public spirit and patriotism. I saw enough of him to know that to be with him was to be stimulated in the best sense of the word for the work of life. Perhaps it is not yet realised how great he was in the matter of knowledge as well as in action. Everybody knows that he was a great man of action in the fullest sense of the word. The Press has always proclaimed that. It is less often that a tribute is paid to him as a man of knowledge as well as a man of action. Two of your greatest experts in natural history told me the other day that Colonel Roosevelt could, in that department of knowledge, hold his own with experts. His knowledge of literature was also very great, and it was knowledge of the best. It is seldom that you find so great a man of action who was also a man of such wide and accurate knowledge. I happened to be impressed by his knowledge of natural history and literature and to have had first-hand evidence of both, but I gather from others that there were other fields of knowledge in which he was also remarkable.

Source: Developing the Leader Within You

Source: The Bed of Procrustes: Philosophical and Practical Aphorisms (2010), p. 78