浜の真砂は尽きるとも世に盗人の種は尽きまじ
はまのまさごはつきるともよにぬすびとのたねはつきまじ
the sand on the beach may disappear, but the makings of thieves never shall
浜の真砂 is read as はまのまさご (hama no masago) and means grains of sand on the beach (i.e. something countless).
はまのまさご
hama no masago
はまのまさごはつきるともよにぬすびとのたねはつきまじ
the sand on the beach may disappear, but the makings of thieves never shall