 महता तपसा लब्धो विविधैश्च परिश्रमैः।एको दशरथस्यैष पुत्रस्सदृशलक्षणः।। 
 Rama is the only one among the sons who resembles his father in various virtues. Dasaratha obtained him after a great deal of austerities and efforts as well. 