One swallow does not make a summer

Every situation or phenomenon has a number of characteristics. When all or most of these features are present one is convinced of the completeness of the situation. For example, when swallows appear in a large number one is sure of the advent of the summer season. But if only one swallow is seen around one cannot say that the summer has set in. Cuckoos sing in the spring season. It by any chance one hears the voice of one cuckoo at one place he cannot be sure that the spring has arrived. Similarly, one can say that a boy is brilliant only when his performance is consistently brilliant. If he shows good results only in one examination and fails in others he is certainly not a talented one. Hence, before one forms an opinion on a person or a thing one must take into account all the aspects of that person or thing.