If you've got something to do, do it. If you doubt your capacity to endure through impossibly tough times, remember the example of Terry Fox. He started the Marathon of Hope 40 years ago and succumbed to his cancer shy of his goal but having run some 5375 km–the equivalent of 128 marathons run in succession.
Never give up on a dream.
Think of a time in your life before this current crisis when you had to persevere, when you had no really good choice, other than to soldier on. I went with friends once for an ascent up Mt. Aberdeen above Lake Louise. We left the car at four in the morning and due to complications on the way we up we didn't get to the top until four in the afternoon. We were on our feet the whole time slogging our way up and through sharp talus, unstable morraines, steep glacial ice, rotten rock bands and deep unconsolidated snow. The summit was of little consolation as we still had a long complicated descent. By ten that night we were still several hours from the car grinding our way up out of a hanging valley with no food or water and dimming headlamps. And yet each of us kept finding the strength to keep putting one foot in front of the other. What else were we going to do? Collapse on the trail and wait for the cold night or an aggressive grizzly to take us? We got to the car 20 hours after leaving it, our bodies in motion the whole ordeal. This memory is my small way of drawing on the spirit of Terry Fox. I'm grateful for his example.
We are more capable than we think we are.