What other motive they can have, is to us, at least, inconceivable.
One can only motive and explain this suicide by self-immolating love.
It is a fault in art because it is impossible to motive it in a few lines.
Filial devotion to her father had been one motive, but not the only one.
In addition to this motive he felt an inclination to probe the matter to its utmost depths.