The second example is a famous opening line from Zhuangzi 《庄子·养生主》: 吾生也有涯, 而知也无涯 - used by Chinese students for centuries to warn against burning out chasing infinite knowledge with finite years.
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涯 today appears almost only in compounds: 天涯 ('horizon, far-off place'), 海涯 ('sea's edge'), 生涯 ('career, life'), 无涯 ('boundless'). Three-dot water radical 氵 + 厓 (cliff) gives the sound and the 'edge of water' image.
Three-drops water radical on the left - the side-form of 水. It indexes 涯 in the water family with 河 river, 海 sea, 湖 lake. A 涯 is literally where land meets water - the shore or water's edge - which is why the water radical leads.
Right side 厓 is a cliff (厂) over stacked earth (圭), supplying the yá sound and a sharp semantic flavour - a steep drop at the edge. Combined with water, the picture sharpens into 'water's edge', extending to the figurative 'limit; horizon' of 生涯 'life's span'.
