'The dreamers are the saviors of the world' is 100 % true. The beautiful world which we are seeing today, is result of dream of peoples and then sustained efforts put for the same.
Here Vision and Ideals are taken as Dream. A person always dreams to become exactly as per his Idle.
Until and unless you dream for any thing, you will never try to achieve it. Therefore for any worthy achievement a vision and Ideal is necessary.
'He who cherishes a beautiful vision, a lofty ideal in his heart, will one day
realize it' and this will again add some more beauty in this world.