emphasis You use phrases such as I can assure you or let me assure you to emphasize the truth of what you are saying. I can assure you that the animals are well cared for
inform positively and with certainty and confidence; "I tell you that man is a crook!
be careful or certain to do something; make certain of something; "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product"
assure somebody of the truth of something with the intention of giving the listener confidence; "I assured him that traveling to Cambodia was safe" inform positively and with certainty and confidence; "I tell you that man is a crook!
To assure someone of something means to make certain that they will get it. Last night's resounding victory over Birmingham City has virtually assured them of promotion Ways must be found to assure our children a decent start in life. = guarantee
To declare to, solemnly; to assert to (any one) with the design of inspiring belief or confidence