Mr Lee was addressing media questions about his daughter's column in The Sunday Times.

His daughter, National Neuroscience Institute director Lee Wei Ling, had revealed he was suffering from a nervous disease that affected his balance.

The disease, sensory peripheral neuropathy, causes the conduction of sensation from his legs to his spinal cord to be impaired which makes his walking unsteady.

Speaking on the sidelines of a tree planting event at Tanjong Pagar GRC yesterday, he said that he had no doubt at all that his disease had not affected his mind, his will nor his resolve.

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