Just picture the Greek economy like a bucket, or rather like a barrel, which has 3 holes at the bottom, about 5 cm from the bottom.
The water level in the barrel represents economic activity (=living standard) and the water being poured into the barrel represents foreign funding. Finally, the 3 holes represent the budget deficit, the current account deficit and capital flight.
If no water is poured into the barrel, the water level will remain rather stable at about 5 cm from the bottom. In practical terms: a low level of economic activity and/or living standard.
If a lot of water is poured into the barrel, the water level will rise to perhaps 10 cm, i. e. substantially increased economic activity and/or living standard. However, there is now more pressure in the barrel and more water will flow out of the 3 holes.
If Greece wants to have a sustainable living standard, it must repair the 3 holes. Once that is done, a lot less water needs to be poured into the barrel in order to increase the water level.