By the experience of active love. Strive to love your neighbour actively and indefatigably. In as far as you advance in love you will grow surer of the reality of God and of the immortality of your soul. If you attain to perfect self-forgetfulness in the love of your neighbour, then you will believe without doubt, and no doubt can possibly enter your soul. This has been tried. This is certain.
Fyodor DostoevskyAnd you're sorry that the ephemeral beauty has faded so rapidly, so irretrievably, that it flashed so deceptively and pointlessly before your eyes - you're sorry, for you didn't even have time to fall in love.
Fyodor Dostoevsky