Strong financial performance is a positive indication, and Eli Lilly is doing well because of their excellent work in type 2 diabetes medicines. The price of their stock is high, but that doesn't mean it will always be in that state.
So I would suggest, before investing, that you evaluate long-term growth prospects, competition, and potential risks. Always remember one thing: diversification is key; don't just rely on only one stock for long-term growth.