To those who lived in ancient times and knew Krishna, there seemed reason for optimism in the new Kali Yuga: for in the Kali Yuga, it was (to them) easier to achieve success. However, though success may be achieved merely by thought, action, and intention, the conditions for performing Yoga have become more difficult, and it is neither easier nor more difficult than it ever has been. True, a star becomes easier to see as the night rises, but though it is difficult to lose our way under such guidance, there are other difficulties to traveling at night which discourage even experienced travelers from wandering in the wilderness without the light of day.
Water which falls from the sky finds its way back to the ocean, and back to the sky - no matter where it lands, whether on a mountain, or in a rushing river. It finds its way to the ocean not by any skill, but because of its nature. Success is guaranteed in every Yuga, though not without difficulty.