The phrase "strict observance" refers to closely following rules, guidelines, or customs without any room for leniency or deviations. It implies a rigorous adherence to regulations or practices with no exceptions or compromises. Full definition
He stressed the importance of strict observance of service rules imposed by the state in which the person served was found. (newlawjournal.co.uk)
In strict observance of that tradition we never employ violence as a means of pursuing our interest and at every opportunity, we opt for peaceful engagements and implore people to eschew violence in all its ramifications,» it said. (nigeriapoliticsonline.com)
While not at all strenuous, nadi shodhanam does require strict observance of the following form and technique if you wish to achieve channel purification. (yogainternational.com)