We must all hang together, or assuredly we shall all hang separately.
— Benjamin Franklin

The more intensely we feel about an idea or a goal, the more assuredly the idea, buried deep in our subconscious, will direct us along the path to its fulfillment.
Earl Nightingale assuredly quote

If you believe you can, you probably can. If you believe you won t, you most assuredly won t. Belief is the ignition switch that gets you off the launching pad.
— Denis Waitley

It may be that without a vision men shall die. It is no less true that, without hard practical sense, they shall also die. Without Jefferson the new nation might have lost its soul. Without Hamilton it would assuredly have been killed in body.
— James Truslow Adams

I have, indeed, even omitted facts, which, on account of their singularity, must in the eyes of some have appeared to border on the marvelous. But in the forests of South America such extraordinary realities are to be found, that there is assuredly no need to have recourse to fiction or the least exaggeration.
— Captain J. G. Stedman