The Kural in life
The source that both makes and is.
Think of a good teacher who not only gives you work to do but is themselves the example you learn from — both the maker of the lesson and the lesson. Valluvar sees rain that way: it grows the food you eat, and as the water you drink, it becomes part of the meal itself.
Hunger and thirst, both answered.
Two of the body's most basic needs — to be fed and to drink — are met by one and the same source. Valluvar's point is quietly complete: rain doesn't just help with life, it covers life's two simplest demands at once.
The gift inside the gift.
Some things give and then step back; the best ones give, and then give themselves too. Rain grows the harvest and is also the very water on your table — a giver that doesn't hold itself apart from the gift.
Rain is both the maker of food and food itself.
Valluvar uses a deliberate play on the word thuppu — 'sustenance' — to say two things at once: rain produces the food that nourishes us, and rain, as water, is itself something we consume. So it answers both hunger and thirst, the body's two plainest needs, from a single source.
Recognise the sources that give twice over.
Some things in your life don't just enable good — they are themselves the good. A parent who provides for you and is also your example; work that pays you and also shapes you. When you find a source like that, treat it with the care it deserves; it is rarer than it looks.