The Lord told Solomon that He would endow him with riches, honor and wisdom. Over the centuries he has been noted as the wisest man who ever lived. Diversification is essential regardless of your age, income level, time frame, or personality. As your savings grow, your diversity should grow, too. Diversification does not guarantee success, but it does reduce the risks.
Mutual funds offer a high degree of diversification within a single fund.
This is good advice for anyone, but it is essential for Christians. If not, stay away from it - no matter what the potential profit. There are investments that can yield high rates of return with little or no risk. The difficulty is that they prey off the weaknesses of others. Christians need to consider investing in any company or mutual fund that would be deemed socially unethical.